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Finding the Fourth Proportional to 118.71, 162.90 and 117.36

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Solution

The fourth proportional to 118.71, 162.90 and 117.36 is: 161.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.71 : 162.90 = 117.36 : x
  2. Step 2: Convert to fraction form
    118.71/162.90 = 117.36/x
  3. Step 3: Cross multiply
    118.71x = 162.90 × 117.36
  4. Step 4: Simplify right side
    118.71x = 19,117.94
  5. Step 5: Solve for x
    x = 19,117.94/118.71
  6. Step 6: Final answer
    x = 161.05

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.