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Finding the Fourth Proportional to 714.66, 1,071.06 and 641.76

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Solution

The fourth proportional to 714.66, 1,071.06 and 641.76 is: 961.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.66 : 1,071.06 = 641.76 : x
  2. Step 2: Convert to fraction form
    714.66/1,071.06 = 641.76/x
  3. Step 3: Cross multiply
    714.66x = 1,071.06 × 641.76
  4. Step 4: Simplify right side
    714.66x = 687,363.47
  5. Step 5: Solve for x
    x = 687,363.47/714.66
  6. Step 6: Final answer
    x = 961.80

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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.