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Finding the Fourth Proportional to 637.28, 878.72 and 553.64

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Solution

The fourth proportional to 637.28, 878.72 and 553.64 is: 763.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.28 : 878.72 = 553.64 : x
  2. Step 2: Convert to fraction form
    637.28/878.72 = 553.64/x
  3. Step 3: Cross multiply
    637.28x = 878.72 × 553.64
  4. Step 4: Simplify right side
    637.28x = 486,494.54
  5. Step 5: Solve for x
    x = 486,494.54/637.28
  6. Step 6: Final answer
    x = 763.39

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Double scale
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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.