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Finding the Fourth Proportional to 99.15, 148.99 and 75.39

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Solution

The fourth proportional to 99.15, 148.99 and 75.39 is: 113.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.15 : 148.99 = 75.39 : x
  2. Step 2: Convert to fraction form
    99.15/148.99 = 75.39/x
  3. Step 3: Cross multiply
    99.15x = 148.99 × 75.39
  4. Step 4: Simplify right side
    99.15x = 11,232.36
  5. Step 5: Solve for x
    x = 11,232.36/99.15
  6. Step 6: Final answer
    x = 113.29

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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.