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Finding the Fourth Proportional to 107.87, 148.88 and 66.42

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Solution

The fourth proportional to 107.87, 148.88 and 66.42 is: 91.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.87 : 148.88 = 66.42 : x
  2. Step 2: Convert to fraction form
    107.87/148.88 = 66.42/x
  3. Step 3: Cross multiply
    107.87x = 148.88 × 66.42
  4. Step 4: Simplify right side
    107.87x = 9,888.61
  5. Step 5: Solve for x
    x = 9,888.61/107.87
  6. Step 6: Final answer
    x = 91.67

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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.