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Finding the Fourth Proportional to 112.88, 169.45 and 87.32

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Solution

The fourth proportional to 112.88, 169.45 and 87.32 is: 131.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.88 : 169.45 = 87.32 : x
  2. Step 2: Convert to fraction form
    112.88/169.45 = 87.32/x
  3. Step 3: Cross multiply
    112.88x = 169.45 × 87.32
  4. Step 4: Simplify right side
    112.88x = 14,796.37
  5. Step 5: Solve for x
    x = 14,796.37/112.88
  6. Step 6: Final answer
    x = 131.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.