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Finding the Fourth Proportional to 121.60, 182.28 and 56.64

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Solution

The fourth proportional to 121.60, 182.28 and 56.64 is: 84.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.60 : 182.28 = 56.64 : x
  2. Step 2: Convert to fraction form
    121.60/182.28 = 56.64/x
  3. Step 3: Cross multiply
    121.60x = 182.28 × 56.64
  4. Step 4: Simplify right side
    121.60x = 10,324.34
  5. Step 5: Solve for x
    x = 10,324.34/121.60
  6. Step 6: Final answer
    x = 84.90

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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.