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Finding the Fourth Proportional to 1,026.92, 1,539.72 and 872.90

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Solution

The fourth proportional to 1,026.92, 1,539.72 and 872.90 is: 1,308.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,026.92 : 1,539.72 = 872.90 : x
  2. Step 2: Convert to fraction form
    1,026.92/1,539.72 = 872.90/x
  3. Step 3: Cross multiply
    1,026.92x = 1,539.72 × 872.90
  4. Step 4: Simplify right side
    1,026.92x = 1,344,021.59
  5. Step 5: Solve for x
    x = 1,344,021.59/1,026.92
  6. Step 6: Final answer
    x = 1,308.79

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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.