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Finding the Fourth Proportional to 113.49, 156.38 and 105.39

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Solution

The fourth proportional to 113.49, 156.38 and 105.39 is: 145.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.49 : 156.38 = 105.39 : x
  2. Step 2: Convert to fraction form
    113.49/156.38 = 105.39/x
  3. Step 3: Cross multiply
    113.49x = 156.38 × 105.39
  4. Step 4: Simplify right side
    113.49x = 16,480.36
  5. Step 5: Solve for x
    x = 16,480.36/113.49
  6. Step 6: Final answer
    x = 145.21

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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.