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Finding the Fourth Proportional to 98.42, 147.69 and 79.11

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Solution

The fourth proportional to 98.42, 147.69 and 79.11 is: 118.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.42 : 147.69 = 79.11 : x
  2. Step 2: Convert to fraction form
    98.42/147.69 = 79.11/x
  3. Step 3: Cross multiply
    98.42x = 147.69 × 79.11
  4. Step 4: Simplify right side
    98.42x = 11,683.76
  5. Step 5: Solve for x
    x = 11,683.76/98.42
  6. Step 6: Final answer
    x = 118.72

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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.