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Finding the Fourth Proportional to 107.76, 148.32 and 99.66

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Solution

The fourth proportional to 107.76, 148.32 and 99.66 is: 137.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.76 : 148.32 = 99.66 : x
  2. Step 2: Convert to fraction form
    107.76/148.32 = 99.66/x
  3. Step 3: Cross multiply
    107.76x = 148.32 × 99.66
  4. Step 4: Simplify right side
    107.76x = 14,781.57
  5. Step 5: Solve for x
    x = 14,781.57/107.76
  6. Step 6: Final answer
    x = 137.17

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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.