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Finding the Fourth Proportional to 71.99, 99.24 and 63.80

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Solution

The fourth proportional to 71.99, 99.24 and 63.80 is: 87.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.99 : 99.24 = 63.80 : x
  2. Step 2: Convert to fraction form
    71.99/99.24 = 63.80/x
  3. Step 3: Cross multiply
    71.99x = 99.24 × 63.80
  4. Step 4: Simplify right side
    71.99x = 6,331.51
  5. Step 5: Solve for x
    x = 6,331.51/71.99
  6. Step 6: Final answer
    x = 87.95

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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.