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Finding the Fourth Proportional to 111.32, 153.66 and 87.95

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Solution

The fourth proportional to 111.32, 153.66 and 87.95 is: 121.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.32 : 153.66 = 87.95 : x
  2. Step 2: Convert to fraction form
    111.32/153.66 = 87.95/x
  3. Step 3: Cross multiply
    111.32x = 153.66 × 87.95
  4. Step 4: Simplify right side
    111.32x = 13,513.63
  5. Step 5: Solve for x
    x = 13,513.63/111.32
  6. Step 6: Final answer
    x = 121.40

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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.