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Finding the Fourth Proportional to 99.51, 149.06 and 91.95

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Solution

The fourth proportional to 99.51, 149.06 and 91.95 is: 137.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.51 : 149.06 = 91.95 : x
  2. Step 2: Convert to fraction form
    99.51/149.06 = 91.95/x
  3. Step 3: Cross multiply
    99.51x = 149.06 × 91.95
  4. Step 4: Simplify right side
    99.51x = 13,705.61
  5. Step 5: Solve for x
    x = 13,705.61/99.51
  6. Step 6: Final answer
    x = 137.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.