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Finding the Fourth Proportional to 86, 118.50 and 72.20

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Solution

The fourth proportional to 86, 118.50 and 72.20 is: 99.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    86 : 118.50 = 72.20 : x
  2. Step 2: Convert to fraction form
    86/118.50 = 72.20/x
  3. Step 3: Cross multiply
    86x = 118.50 × 72.20
  4. Step 4: Simplify right side
    86x = 8,555.70
  5. Step 5: Solve for x
    x = 8,555.70/86
  6. Step 6: Final answer
    x = 99.48

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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.