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Finding the Fourth Proportional to 107.42, 148.20 and 86.76

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Solution

The fourth proportional to 107.42, 148.20 and 86.76 is: 119.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.42 : 148.20 = 86.76 : x
  2. Step 2: Convert to fraction form
    107.42/148.20 = 86.76/x
  3. Step 3: Cross multiply
    107.42x = 148.20 × 86.76
  4. Step 4: Simplify right side
    107.42x = 12,857.83
  5. Step 5: Solve for x
    x = 12,857.83/107.42
  6. Step 6: Final answer
    x = 119.70

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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.