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Finding the Fourth Proportional to 113.09, 156.09 and 76.23

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Solution

The fourth proportional to 113.09, 156.09 and 76.23 is: 105.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.09 : 156.09 = 76.23 : x
  2. Step 2: Convert to fraction form
    113.09/156.09 = 76.23/x
  3. Step 3: Cross multiply
    113.09x = 156.09 × 76.23
  4. Step 4: Simplify right side
    113.09x = 11,898.74
  5. Step 5: Solve for x
    x = 11,898.74/113.09
  6. Step 6: Final answer
    x = 105.22

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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.