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Finding the Fourth Proportional to 99.04, 149.08 and 87.28

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Solution

The fourth proportional to 99.04, 149.08 and 87.28 is: 131.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.04 : 149.08 = 87.28 : x
  2. Step 2: Convert to fraction form
    99.04/149.08 = 87.28/x
  3. Step 3: Cross multiply
    99.04x = 149.08 × 87.28
  4. Step 4: Simplify right side
    99.04x = 13,011.70
  5. Step 5: Solve for x
    x = 13,011.70/99.04
  6. Step 6: Final answer
    x = 131.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.