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Finding the Fourth Proportional to 12,812.30, 19,218.45 and 10,220.30

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Solution

The fourth proportional to 12,812.30, 19,218.45 and 10,220.30 is: 15,330.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,812.30 : 19,218.45 = 10,220.30 : x
  2. Step 2: Convert to fraction form
    12,812.30/19,218.45 = 10,220.30/x
  3. Step 3: Cross multiply
    12,812.30x = 19,218.45 × 10,220.30
  4. Step 4: Simplify right side
    12,812.30x = 196,418,324.54
  5. Step 5: Solve for x
    x = 196,418,324.54/12,812.30
  6. Step 6: Final answer
    x = 15,330.45

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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.