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Finding the Fourth Proportional to 716.28, 987.22 and 654.28

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Solution

The fourth proportional to 716.28, 987.22 and 654.28 is: 901.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.28 : 987.22 = 654.28 : x
  2. Step 2: Convert to fraction form
    716.28/987.22 = 654.28/x
  3. Step 3: Cross multiply
    716.28x = 987.22 × 654.28
  4. Step 4: Simplify right side
    716.28x = 645,918.30
  5. Step 5: Solve for x
    x = 645,918.30/716.28
  6. Step 6: Final answer
    x = 901.77

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Double scale
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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.