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Finding the Fourth Proportional to 711.62, 1,061.92 and 629.61

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Solution

The fourth proportional to 711.62, 1,061.92 and 629.61 is: 939.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.62 : 1,061.92 = 629.61 : x
  2. Step 2: Convert to fraction form
    711.62/1,061.92 = 629.61/x
  3. Step 3: Cross multiply
    711.62x = 1,061.92 × 629.61
  4. Step 4: Simplify right side
    711.62x = 668,595.45
  5. Step 5: Solve for x
    x = 668,595.45/711.62
  6. Step 6: Final answer
    x = 939.54

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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.