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Finding the Fourth Proportional to 113.31, 156.24 and 84.02

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Solution

The fourth proportional to 113.31, 156.24 and 84.02 is: 115.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.31 : 156.24 = 84.02 : x
  2. Step 2: Convert to fraction form
    113.31/156.24 = 84.02/x
  3. Step 3: Cross multiply
    113.31x = 156.24 × 84.02
  4. Step 4: Simplify right side
    113.31x = 13,126.50
  5. Step 5: Solve for x
    x = 13,126.50/113.31
  6. Step 6: Final answer
    x = 115.85

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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.