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Finding the Fourth Proportional to 457.61, 686.40 and 197.78

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Solution

The fourth proportional to 457.61, 686.40 and 197.78 is: 296.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.61 : 686.40 = 197.78 : x
  2. Step 2: Convert to fraction form
    457.61/686.40 = 197.78/x
  3. Step 3: Cross multiply
    457.61x = 686.40 × 197.78
  4. Step 4: Simplify right side
    457.61x = 135,752.76
  5. Step 5: Solve for x
    x = 135,752.76/457.61
  6. Step 6: Final answer
    x = 296.66

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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.