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Finding the Fourth Proportional to 99.22, 136.98 and 78.58

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Solution

The fourth proportional to 99.22, 136.98 and 78.58 is: 108.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.22 : 136.98 = 78.58 : x
  2. Step 2: Convert to fraction form
    99.22/136.98 = 78.58/x
  3. Step 3: Cross multiply
    99.22x = 136.98 × 78.58
  4. Step 4: Simplify right side
    99.22x = 10,763.01
  5. Step 5: Solve for x
    x = 10,763.01/99.22
  6. Step 6: Final answer
    x = 108.48

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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.