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Finding the Fourth Proportional to 766.47, 1,057.15 and 497.35

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Solution

The fourth proportional to 766.47, 1,057.15 and 497.35 is: 685.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.47 : 1,057.15 = 497.35 : x
  2. Step 2: Convert to fraction form
    766.47/1,057.15 = 497.35/x
  3. Step 3: Cross multiply
    766.47x = 1,057.15 × 497.35
  4. Step 4: Simplify right side
    766.47x = 525,773.55
  5. Step 5: Solve for x
    x = 525,773.55/766.47
  6. Step 6: Final answer
    x = 685.97

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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.