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Finding the Fourth Proportional to 113.40, 156.20 and 91.17

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Solution

The fourth proportional to 113.40, 156.20 and 91.17 is: 125.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.40 : 156.20 = 91.17 : x
  2. Step 2: Convert to fraction form
    113.40/156.20 = 91.17/x
  3. Step 3: Cross multiply
    113.40x = 156.20 × 91.17
  4. Step 4: Simplify right side
    113.40x = 14,240.30
  5. Step 5: Solve for x
    x = 14,240.30/113.40
  6. Step 6: Final answer
    x = 125.58

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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.