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Finding the Fourth Proportional to 113.06, 156.03 and 61.31

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Solution

The fourth proportional to 113.06, 156.03 and 61.31 is: 84.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.06 : 156.03 = 61.31 : x
  2. Step 2: Convert to fraction form
    113.06/156.03 = 61.31/x
  3. Step 3: Cross multiply
    113.06x = 156.03 × 61.31
  4. Step 4: Simplify right side
    113.06x = 9,566.36
  5. Step 5: Solve for x
    x = 9,566.36/113.06
  6. Step 6: Final answer
    x = 84.61

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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.