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Finding the Fourth Proportional to 708.42, 1,062.46 and 478.72

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Solution

The fourth proportional to 708.42, 1,062.46 and 478.72 is: 717.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.42 : 1,062.46 = 478.72 : x
  2. Step 2: Convert to fraction form
    708.42/1,062.46 = 478.72/x
  3. Step 3: Cross multiply
    708.42x = 1,062.46 × 478.72
  4. Step 4: Simplify right side
    708.42x = 508,620.85
  5. Step 5: Solve for x
    x = 508,620.85/708.42
  6. Step 6: Final answer
    x = 717.97

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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.