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Finding the Fourth Proportional to 657.72, 985.18 and 627.64

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Solution

The fourth proportional to 657.72, 985.18 and 627.64 is: 940.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.72 : 985.18 = 627.64 : x
  2. Step 2: Convert to fraction form
    657.72/985.18 = 627.64/x
  3. Step 3: Cross multiply
    657.72x = 985.18 × 627.64
  4. Step 4: Simplify right side
    657.72x = 618,338.38
  5. Step 5: Solve for x
    x = 618,338.38/657.72
  6. Step 6: Final answer
    x = 940.12

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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.