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Finding the Fourth Proportional to 99.97, 137.94 and 72.40

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Solution

The fourth proportional to 99.97, 137.94 and 72.40 is: 99.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.97 : 137.94 = 72.40 : x
  2. Step 2: Convert to fraction form
    99.97/137.94 = 72.40/x
  3. Step 3: Cross multiply
    99.97x = 137.94 × 72.40
  4. Step 4: Simplify right side
    99.97x = 9,986.50
  5. Step 5: Solve for x
    x = 9,986.50/99.97
  6. Step 6: Final answer
    x = 99.89

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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.