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Finding the Fourth Proportional to 710.08, 1,066.56 and 689.92

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Solution

The fourth proportional to 710.08, 1,066.56 and 689.92 is: 1,036.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.08 : 1,066.56 = 689.92 : x
  2. Step 2: Convert to fraction form
    710.08/1,066.56 = 689.92/x
  3. Step 3: Cross multiply
    710.08x = 1,066.56 × 689.92
  4. Step 4: Simplify right side
    710.08x = 735,841.08
  5. Step 5: Solve for x
    x = 735,841.08/710.08
  6. Step 6: Final answer
    x = 1,036.28

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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.