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Finding the Fourth Proportional to 113.72, 156.87 and 72.20

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Solution

The fourth proportional to 113.72, 156.87 and 72.20 is: 99.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.72 : 156.87 = 72.20 : x
  2. Step 2: Convert to fraction form
    113.72/156.87 = 72.20/x
  3. Step 3: Cross multiply
    113.72x = 156.87 × 72.20
  4. Step 4: Simplify right side
    113.72x = 11,326.41
  5. Step 5: Solve for x
    x = 11,326.41/113.72
  6. Step 6: Final answer
    x = 99.60

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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.