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Finding the Fourth Proportional to 847.29, 1,272.21 and 691.59

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Solution

The fourth proportional to 847.29, 1,272.21 and 691.59 is: 1,038.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.29 : 1,272.21 = 691.59 : x
  2. Step 2: Convert to fraction form
    847.29/1,272.21 = 691.59/x
  3. Step 3: Cross multiply
    847.29x = 1,272.21 × 691.59
  4. Step 4: Simplify right side
    847.29x = 879,847.71
  5. Step 5: Solve for x
    x = 879,847.71/847.29
  6. Step 6: Final answer
    x = 1,038.43

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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.