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Finding the Fourth Proportional to 73.90, 101.88 and 63.65

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Solution

The fourth proportional to 73.90, 101.88 and 63.65 is: 87.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.90 : 101.88 = 63.65 : x
  2. Step 2: Convert to fraction form
    73.90/101.88 = 63.65/x
  3. Step 3: Cross multiply
    73.90x = 101.88 × 63.65
  4. Step 4: Simplify right side
    73.90x = 6,484.77
  5. Step 5: Solve for x
    x = 6,484.77/73.90
  6. Step 6: Final answer
    x = 87.75

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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.