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Finding the Fourth Proportional to 117.92, 176.76 and 53.80

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Solution

The fourth proportional to 117.92, 176.76 and 53.80 is: 80.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.92 : 176.76 = 53.80 : x
  2. Step 2: Convert to fraction form
    117.92/176.76 = 53.80/x
  3. Step 3: Cross multiply
    117.92x = 176.76 × 53.80
  4. Step 4: Simplify right side
    117.92x = 9,509.69
  5. Step 5: Solve for x
    x = 9,509.69/117.92
  6. Step 6: Final answer
    x = 80.65

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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.