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Finding the Fourth Proportional to 99.57, 149.30 and 45.42

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Solution

The fourth proportional to 99.57, 149.30 and 45.42 is: 68.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.57 : 149.30 = 45.42 : x
  2. Step 2: Convert to fraction form
    99.57/149.30 = 45.42/x
  3. Step 3: Cross multiply
    99.57x = 149.30 × 45.42
  4. Step 4: Simplify right side
    99.57x = 6,780.84
  5. Step 5: Solve for x
    x = 6,780.84/99.57
  6. Step 6: Final answer
    x = 68.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.