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Finding the Fourth Proportional to 711.46, 1,065.84 and 479.71

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Solution

The fourth proportional to 711.46, 1,065.84 and 479.71 is: 718.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.46 : 1,065.84 = 479.71 : x
  2. Step 2: Convert to fraction form
    711.46/1,065.84 = 479.71/x
  3. Step 3: Cross multiply
    711.46x = 1,065.84 × 479.71
  4. Step 4: Simplify right side
    711.46x = 511,294.11
  5. Step 5: Solve for x
    x = 511,294.11/711.46
  6. Step 6: Final answer
    x = 718.65

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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.