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Finding the Fourth Proportional to 120.13, 165.51 and 112.57

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Solution

The fourth proportional to 120.13, 165.51 and 112.57 is: 155.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.13 : 165.51 = 112.57 : x
  2. Step 2: Convert to fraction form
    120.13/165.51 = 112.57/x
  3. Step 3: Cross multiply
    120.13x = 165.51 × 112.57
  4. Step 4: Simplify right side
    120.13x = 18,631.46
  5. Step 5: Solve for x
    x = 18,631.46/120.13
  6. Step 6: Final answer
    x = 155.09

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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.