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Finding the Fourth Proportional to 118.13, 162.93 and 86.55

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Solution

The fourth proportional to 118.13, 162.93 and 86.55 is: 119.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.13 : 162.93 = 86.55 : x
  2. Step 2: Convert to fraction form
    118.13/162.93 = 86.55/x
  3. Step 3: Cross multiply
    118.13x = 162.93 × 86.55
  4. Step 4: Simplify right side
    118.13x = 14,101.59
  5. Step 5: Solve for x
    x = 14,101.59/118.13
  6. Step 6: Final answer
    x = 119.38

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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.