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Finding the Fourth Proportional to 99.04, 136.40 and 90.96

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Solution

The fourth proportional to 99.04, 136.40 and 90.96 is: 125.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.04 : 136.40 = 90.96 : x
  2. Step 2: Convert to fraction form
    99.04/136.40 = 90.96/x
  3. Step 3: Cross multiply
    99.04x = 136.40 × 90.96
  4. Step 4: Simplify right side
    99.04x = 12,406.94
  5. Step 5: Solve for x
    x = 12,406.94/99.04
  6. Step 6: Final answer
    x = 125.27

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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.