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Finding the Fourth Proportional to 99.35, 148.78 and 83.08

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Solution

The fourth proportional to 99.35, 148.78 and 83.08 is: 124.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.35 : 148.78 = 83.08 : x
  2. Step 2: Convert to fraction form
    99.35/148.78 = 83.08/x
  3. Step 3: Cross multiply
    99.35x = 148.78 × 83.08
  4. Step 4: Simplify right side
    99.35x = 12,360.64
  5. Step 5: Solve for x
    x = 12,360.64/99.35
  6. Step 6: Final answer
    x = 124.42

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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.