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Finding the Fourth Proportional to 118.42, 162.93 and 115.69

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Solution

The fourth proportional to 118.42, 162.93 and 115.69 is: 159.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.42 : 162.93 = 115.69 : x
  2. Step 2: Convert to fraction form
    118.42/162.93 = 115.69/x
  3. Step 3: Cross multiply
    118.42x = 162.93 × 115.69
  4. Step 4: Simplify right side
    118.42x = 18,849.37
  5. Step 5: Solve for x
    x = 18,849.37/118.42
  6. Step 6: Final answer
    x = 159.17

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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.