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Finding the Fourth Proportional to 711.92, 1,069.80 and 671.82

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Solution

The fourth proportional to 711.92, 1,069.80 and 671.82 is: 1,009.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.92 : 1,069.80 = 671.82 : x
  2. Step 2: Convert to fraction form
    711.92/1,069.80 = 671.82/x
  3. Step 3: Cross multiply
    711.92x = 1,069.80 × 671.82
  4. Step 4: Simplify right side
    711.92x = 718,710.52
  5. Step 5: Solve for x
    x = 718,710.52/711.92
  6. Step 6: Final answer
    x = 1,009.55

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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.