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Finding the Fourth Proportional to 711.87, 1,066.86 and 638.34

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Solution

The fourth proportional to 711.87, 1,066.86 and 638.34 is: 956.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.87 : 1,066.86 = 638.34 : x
  2. Step 2: Convert to fraction form
    711.87/1,066.86 = 638.34/x
  3. Step 3: Cross multiply
    711.87x = 1,066.86 × 638.34
  4. Step 4: Simplify right side
    711.87x = 681,019.41
  5. Step 5: Solve for x
    x = 681,019.41/711.87
  6. Step 6: Final answer
    x = 956.66

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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.