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Finding the Fourth Proportional to 99.33, 137.09 and 57.90

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Solution

The fourth proportional to 99.33, 137.09 and 57.90 is: 79.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.33 : 137.09 = 57.90 : x
  2. Step 2: Convert to fraction form
    99.33/137.09 = 57.90/x
  3. Step 3: Cross multiply
    99.33x = 137.09 × 57.90
  4. Step 4: Simplify right side
    99.33x = 7,937.22
  5. Step 5: Solve for x
    x = 7,937.22/99.33
  6. Step 6: Final answer
    x = 79.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.