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Finding the Fourth Proportional to 99.91, 149.79 and 39.02

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Solution

The fourth proportional to 99.91, 149.79 and 39.02 is: 58.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.91 : 149.79 = 39.02 : x
  2. Step 2: Convert to fraction form
    99.91/149.79 = 39.02/x
  3. Step 3: Cross multiply
    99.91x = 149.79 × 39.02
  4. Step 4: Simplify right side
    99.91x = 5,844.81
  5. Step 5: Solve for x
    x = 5,844.81/99.91
  6. Step 6: Final answer
    x = 58.50

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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.