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Finding the Fourth Proportional to 862.60, 1,290.64 and 725.64

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Solution

The fourth proportional to 862.60, 1,290.64 and 725.64 is: 1,085.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.60 : 1,290.64 = 725.64 : x
  2. Step 2: Convert to fraction form
    862.60/1,290.64 = 725.64/x
  3. Step 3: Cross multiply
    862.60x = 1,290.64 × 725.64
  4. Step 4: Simplify right side
    862.60x = 936,540.01
  5. Step 5: Solve for x
    x = 936,540.01/862.60
  6. Step 6: Final answer
    x = 1,085.72

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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.