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Finding the Fourth Proportional to 847.20, 1,168.80 and 497.76

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Solution

The fourth proportional to 847.20, 1,168.80 and 497.76 is: 686.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.20 : 1,168.80 = 497.76 : x
  2. Step 2: Convert to fraction form
    847.20/1,168.80 = 497.76/x
  3. Step 3: Cross multiply
    847.20x = 1,168.80 × 497.76
  4. Step 4: Simplify right side
    847.20x = 581,781.89
  5. Step 5: Solve for x
    x = 581,781.89/847.20
  6. Step 6: Final answer
    x = 686.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.