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Finding the Fourth Proportional to 716.88, 1,068.12 and 669.74

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Solution

The fourth proportional to 716.88, 1,068.12 and 669.74 is: 997.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.88 : 1,068.12 = 669.74 : x
  2. Step 2: Convert to fraction form
    716.88/1,068.12 = 669.74/x
  3. Step 3: Cross multiply
    716.88x = 1,068.12 × 669.74
  4. Step 4: Simplify right side
    716.88x = 715,357.35
  5. Step 5: Solve for x
    x = 715,357.35/716.88
  6. Step 6: Final answer
    x = 997.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.