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Finding the Fourth Proportional to 67.80, 100.92 and 67.50

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Solution

The fourth proportional to 67.80, 100.92 and 67.50 is: 100.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.80 : 100.92 = 67.50 : x
  2. Step 2: Convert to fraction form
    67.80/100.92 = 67.50/x
  3. Step 3: Cross multiply
    67.80x = 100.92 × 67.50
  4. Step 4: Simplify right side
    67.80x = 6,812.10
  5. Step 5: Solve for x
    x = 6,812.10/67.80
  6. Step 6: Final answer
    x = 100.47

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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.