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Finding the Fourth Proportional to 117.51, 176.03 and 80.86

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Solution

The fourth proportional to 117.51, 176.03 and 80.86 is: 121.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.51 : 176.03 = 80.86 : x
  2. Step 2: Convert to fraction form
    117.51/176.03 = 80.86/x
  3. Step 3: Cross multiply
    117.51x = 176.03 × 80.86
  4. Step 4: Simplify right side
    117.51x = 14,233.79
  5. Step 5: Solve for x
    x = 14,233.79/117.51
  6. Step 6: Final answer
    x = 121.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.