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Finding the Fourth Proportional to 862.60, 1,291.74 and 688.52

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Solution

The fourth proportional to 862.60, 1,291.74 and 688.52 is: 1,031.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.60 : 1,291.74 = 688.52 : x
  2. Step 2: Convert to fraction form
    862.60/1,291.74 = 688.52/x
  3. Step 3: Cross multiply
    862.60x = 1,291.74 × 688.52
  4. Step 4: Simplify right side
    862.60x = 889,388.82
  5. Step 5: Solve for x
    x = 889,388.82/862.60
  6. Step 6: Final answer
    x = 1,031.06

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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.