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Finding the Fourth Proportional to 715.64, 1,071.89 and 698.21

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Solution

The fourth proportional to 715.64, 1,071.89 and 698.21 is: 1,045.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.64 : 1,071.89 = 698.21 : x
  2. Step 2: Convert to fraction form
    715.64/1,071.89 = 698.21/x
  3. Step 3: Cross multiply
    715.64x = 1,071.89 × 698.21
  4. Step 4: Simplify right side
    715.64x = 748,395.47
  5. Step 5: Solve for x
    x = 748,395.47/715.64
  6. Step 6: Final answer
    x = 1,045.78

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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.