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Finding the Fourth Proportional to 19,992.30, 29,988.45 and 19,020.30

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Solution

The fourth proportional to 19,992.30, 29,988.45 and 19,020.30 is: 28,530.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,992.30 : 29,988.45 = 19,020.30 : x
  2. Step 2: Convert to fraction form
    19,992.30/29,988.45 = 19,020.30/x
  3. Step 3: Cross multiply
    19,992.30x = 29,988.45 × 19,020.30
  4. Step 4: Simplify right side
    19,992.30x = 570,389,315.54
  5. Step 5: Solve for x
    x = 570,389,315.54/19,992.30
  6. Step 6: Final answer
    x = 28,530.45

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.