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Finding the Fourth Proportional to 99.61, 137.50 and 62.80

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Solution

The fourth proportional to 99.61, 137.50 and 62.80 is: 86.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.61 : 137.50 = 62.80 : x
  2. Step 2: Convert to fraction form
    99.61/137.50 = 62.80/x
  3. Step 3: Cross multiply
    99.61x = 137.50 × 62.80
  4. Step 4: Simplify right side
    99.61x = 8,635
  5. Step 5: Solve for x
    x = 8,635/99.61
  6. Step 6: Final answer
    x = 86.69

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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.