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Finding the Fourth Proportional to 720.29, 1,071.80 and 717.86

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Solution

The fourth proportional to 720.29, 1,071.80 and 717.86 is: 1,068.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.29 : 1,071.80 = 717.86 : x
  2. Step 2: Convert to fraction form
    720.29/1,071.80 = 717.86/x
  3. Step 3: Cross multiply
    720.29x = 1,071.80 × 717.86
  4. Step 4: Simplify right side
    720.29x = 769,404.13
  5. Step 5: Solve for x
    x = 769,404.13/720.29
  6. Step 6: Final answer
    x = 1,068.18

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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.