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Finding the Fourth Proportional to 1,272.68, 1,909.20 and 578.96

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Solution

The fourth proportional to 1,272.68, 1,909.20 and 578.96 is: 868.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.68 : 1,909.20 = 578.96 : x
  2. Step 2: Convert to fraction form
    1,272.68/1,909.20 = 578.96/x
  3. Step 3: Cross multiply
    1,272.68x = 1,909.20 × 578.96
  4. Step 4: Simplify right side
    1,272.68x = 1,105,350.43
  5. Step 5: Solve for x
    x = 1,105,350.43/1,272.68
  6. Step 6: Final answer
    x = 868.52

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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.