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Finding the Fourth Proportional to 88, 131.45 and 72.61

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Solution

The fourth proportional to 88, 131.45 and 72.61 is: 108.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    88 : 131.45 = 72.61 : x
  2. Step 2: Convert to fraction form
    88/131.45 = 72.61/x
  3. Step 3: Cross multiply
    88x = 131.45 × 72.61
  4. Step 4: Simplify right side
    88x = 9,544.58
  5. Step 5: Solve for x
    x = 9,544.58/88
  6. Step 6: Final answer
    x = 108.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.