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Finding the Fourth Proportional to 681.07, 1,020.87 and 356.47

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Solution

The fourth proportional to 681.07, 1,020.87 and 356.47 is: 534.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.07 : 1,020.87 = 356.47 : x
  2. Step 2: Convert to fraction form
    681.07/1,020.87 = 356.47/x
  3. Step 3: Cross multiply
    681.07x = 1,020.87 × 356.47
  4. Step 4: Simplify right side
    681.07x = 363,909.53
  5. Step 5: Solve for x
    x = 363,909.53/681.07
  6. Step 6: Final answer
    x = 534.32

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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.