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Finding the Fourth Proportional to 657.10, 985.65 and 539.65

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Solution

The fourth proportional to 657.10, 985.65 and 539.65 is: 809.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.10 : 985.65 = 539.65 : x
  2. Step 2: Convert to fraction form
    657.10/985.65 = 539.65/x
  3. Step 3: Cross multiply
    657.10x = 985.65 × 539.65
  4. Step 4: Simplify right side
    657.10x = 531,906.02
  5. Step 5: Solve for x
    x = 531,906.02/657.10
  6. Step 6: Final answer
    x = 809.48

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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.