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Finding the Fourth Proportional to 67.50, 100.80 and 62.91

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Solution

The fourth proportional to 67.50, 100.80 and 62.91 is: 93.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.50 : 100.80 = 62.91 : x
  2. Step 2: Convert to fraction form
    67.50/100.80 = 62.91/x
  3. Step 3: Cross multiply
    67.50x = 100.80 × 62.91
  4. Step 4: Simplify right side
    67.50x = 6,341.33
  5. Step 5: Solve for x
    x = 6,341.33/67.50
  6. Step 6: Final answer
    x = 93.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.