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Finding the Fourth Proportional to 862.91, 1,295.27 and 690.58

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Solution

The fourth proportional to 862.91, 1,295.27 and 690.58 is: 1,036.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.91 : 1,295.27 = 690.58 : x
  2. Step 2: Convert to fraction form
    862.91/1,295.27 = 690.58/x
  3. Step 3: Cross multiply
    862.91x = 1,295.27 × 690.58
  4. Step 4: Simplify right side
    862.91x = 894,487.56
  5. Step 5: Solve for x
    x = 894,487.56/862.91
  6. Step 6: Final answer
    x = 1,036.59

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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.