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Finding the Fourth Proportional to 117.64, 176.20 and 74.80

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Solution

The fourth proportional to 117.64, 176.20 and 74.80 is: 112.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.64 : 176.20 = 74.80 : x
  2. Step 2: Convert to fraction form
    117.64/176.20 = 74.80/x
  3. Step 3: Cross multiply
    117.64x = 176.20 × 74.80
  4. Step 4: Simplify right side
    117.64x = 13,179.76
  5. Step 5: Solve for x
    x = 13,179.76/117.64
  6. Step 6: Final answer
    x = 112.03

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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.