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Finding the Fourth Proportional to 99.06, 136.71 and 55.40

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Solution

The fourth proportional to 99.06, 136.71 and 55.40 is: 76.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.06 : 136.71 = 55.40 : x
  2. Step 2: Convert to fraction form
    99.06/136.71 = 55.40/x
  3. Step 3: Cross multiply
    99.06x = 136.71 × 55.40
  4. Step 4: Simplify right side
    99.06x = 7,573.73
  5. Step 5: Solve for x
    x = 7,573.73/99.06
  6. Step 6: Final answer
    x = 76.46

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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.