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Finding the Fourth Proportional to 99.51, 149.36 and 87.39

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Solution

The fourth proportional to 99.51, 149.36 and 87.39 is: 131.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.51 : 149.36 = 87.39 : x
  2. Step 2: Convert to fraction form
    99.51/149.36 = 87.39/x
  3. Step 3: Cross multiply
    99.51x = 149.36 × 87.39
  4. Step 4: Simplify right side
    99.51x = 13,052.57
  5. Step 5: Solve for x
    x = 13,052.57/99.51
  6. Step 6: Final answer
    x = 131.17

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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.