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Finding the Fourth Proportional to 111.60, 154.17 and 87.35

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Solution

The fourth proportional to 111.60, 154.17 and 87.35 is: 120.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.60 : 154.17 = 87.35 : x
  2. Step 2: Convert to fraction form
    111.60/154.17 = 87.35/x
  3. Step 3: Cross multiply
    111.60x = 154.17 × 87.35
  4. Step 4: Simplify right side
    111.60x = 13,465.98
  5. Step 5: Solve for x
    x = 13,465.98/111.60
  6. Step 6: Final answer
    x = 120.66

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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.