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Finding the Fourth Proportional to 12,900.90, 17,801.75 and 7,235.65

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Solution

The fourth proportional to 12,900.90, 17,801.75 and 7,235.65 is: 9,984.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,900.90 : 17,801.75 = 7,235.65 : x
  2. Step 2: Convert to fraction form
    12,900.90/17,801.75 = 7,235.65/x
  3. Step 3: Cross multiply
    12,900.90x = 17,801.75 × 7,235.65
  4. Step 4: Simplify right side
    12,900.90x = 128,807,232.39
  5. Step 5: Solve for x
    x = 128,807,232.39/12,900.90
  6. Step 6: Final answer
    x = 9,984.36

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.