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Finding the Fourth Proportional to 113.10, 156.33 and 100.74

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Solution

The fourth proportional to 113.10, 156.33 and 100.74 is: 139.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.10 : 156.33 = 100.74 : x
  2. Step 2: Convert to fraction form
    113.10/156.33 = 100.74/x
  3. Step 3: Cross multiply
    113.10x = 156.33 × 100.74
  4. Step 4: Simplify right side
    113.10x = 15,749.27
  5. Step 5: Solve for x
    x = 15,749.27/113.10
  6. Step 6: Final answer
    x = 139.26

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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.