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Finding the Fourth Proportional to 72.40, 99.64 and 69.52

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Solution

The fourth proportional to 72.40, 99.64 and 69.52 is: 95.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.40 : 99.64 = 69.52 : x
  2. Step 2: Convert to fraction form
    72.40/99.64 = 69.52/x
  3. Step 3: Cross multiply
    72.40x = 99.64 × 69.52
  4. Step 4: Simplify right side
    72.40x = 6,926.97
  5. Step 5: Solve for x
    x = 6,926.97/72.40
  6. Step 6: Final answer
    x = 95.68

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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.