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Finding the Fourth Proportional to 99.35, 137.09 and 55.68

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Solution

The fourth proportional to 99.35, 137.09 and 55.68 is: 76.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.35 : 137.09 = 55.68 : x
  2. Step 2: Convert to fraction form
    99.35/137.09 = 55.68/x
  3. Step 3: Cross multiply
    99.35x = 137.09 × 55.68
  4. Step 4: Simplify right side
    99.35x = 7,633.31
  5. Step 5: Solve for x
    x = 7,633.31/99.35
  6. Step 6: Final answer
    x = 76.84

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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.