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Finding the Fourth Proportional to 716.61, 987.21 and 506.55

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Solution

The fourth proportional to 716.61, 987.21 and 506.55 is: 697.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.61 : 987.21 = 506.55 : x
  2. Step 2: Convert to fraction form
    716.61/987.21 = 506.55/x
  3. Step 3: Cross multiply
    716.61x = 987.21 × 506.55
  4. Step 4: Simplify right side
    716.61x = 500,071.23
  5. Step 5: Solve for x
    x = 500,071.23/716.61
  6. Step 6: Final answer
    x = 697.83

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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.