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Finding the Fourth Proportional to 712.60, 1,068.86 and 225.64

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Solution

The fourth proportional to 712.60, 1,068.86 and 225.64 is: 338.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.60 : 1,068.86 = 225.64 : x
  2. Step 2: Convert to fraction form
    712.60/1,068.86 = 225.64/x
  3. Step 3: Cross multiply
    712.60x = 1,068.86 × 225.64
  4. Step 4: Simplify right side
    712.60x = 241,177.57
  5. Step 5: Solve for x
    x = 241,177.57/712.60
  6. Step 6: Final answer
    x = 338.45

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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.