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Finding the Fourth Proportional to 113.58, 156.78 and 72.12

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Solution

The fourth proportional to 113.58, 156.78 and 72.12 is: 99.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.58 : 156.78 = 72.12 : x
  2. Step 2: Convert to fraction form
    113.58/156.78 = 72.12/x
  3. Step 3: Cross multiply
    113.58x = 156.78 × 72.12
  4. Step 4: Simplify right side
    113.58x = 11,306.97
  5. Step 5: Solve for x
    x = 11,306.97/113.58
  6. Step 6: Final answer
    x = 99.55

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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.