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Finding the Fourth Proportional to 113.55, 156.57 and 72.11

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Solution

The fourth proportional to 113.55, 156.57 and 72.11 is: 99.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.55 : 156.57 = 72.11 : x
  2. Step 2: Convert to fraction form
    113.55/156.57 = 72.11/x
  3. Step 3: Cross multiply
    113.55x = 156.57 × 72.11
  4. Step 4: Simplify right side
    113.55x = 11,289.48
  5. Step 5: Solve for x
    x = 11,289.48/113.55
  6. Step 6: Final answer
    x = 99.42

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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.