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Finding the Fourth Proportional to 113.33, 156.31 and 71.85

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Solution

The fourth proportional to 113.33, 156.31 and 71.85 is: 99.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.33 : 156.31 = 71.85 : x
  2. Step 2: Convert to fraction form
    113.33/156.31 = 71.85/x
  3. Step 3: Cross multiply
    113.33x = 156.31 × 71.85
  4. Step 4: Simplify right side
    113.33x = 11,231.28
  5. Step 5: Solve for x
    x = 11,231.28/113.33
  6. Step 6: Final answer
    x = 99.10

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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.