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Finding the Fourth Proportional to 99.75, 137.67 and 56.09

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Solution

The fourth proportional to 99.75, 137.67 and 56.09 is: 77.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.75 : 137.67 = 56.09 : x
  2. Step 2: Convert to fraction form
    99.75/137.67 = 56.09/x
  3. Step 3: Cross multiply
    99.75x = 137.67 × 56.09
  4. Step 4: Simplify right side
    99.75x = 7,721.91
  5. Step 5: Solve for x
    x = 7,721.91/99.75
  6. Step 6: Final answer
    x = 77.41

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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.