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Finding the Fourth Proportional to 99.45, 137.21 and 74.84

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Solution

The fourth proportional to 99.45, 137.21 and 74.84 is: 103.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.45 : 137.21 = 74.84 : x
  2. Step 2: Convert to fraction form
    99.45/137.21 = 74.84/x
  3. Step 3: Cross multiply
    99.45x = 137.21 × 74.84
  4. Step 4: Simplify right side
    99.45x = 10,267.74
  5. Step 5: Solve for x
    x = 10,267.74/99.45
  6. Step 6: Final answer
    x = 103.25

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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.