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Finding the Fourth Proportional to 99.88, 137.86 and 72.40

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Solution

The fourth proportional to 99.88, 137.86 and 72.40 is: 99.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.88 : 137.86 = 72.40 : x
  2. Step 2: Convert to fraction form
    99.88/137.86 = 72.40/x
  3. Step 3: Cross multiply
    99.88x = 137.86 × 72.40
  4. Step 4: Simplify right side
    99.88x = 9,981.06
  5. Step 5: Solve for x
    x = 9,981.06/99.88
  6. Step 6: Final answer
    x = 99.93

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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.