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Finding the Fourth Proportional to 1,275.60, 1,909.20 and 1,042.64

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Solution

The fourth proportional to 1,275.60, 1,909.20 and 1,042.64 is: 1,560.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.60 : 1,909.20 = 1,042.64 : x
  2. Step 2: Convert to fraction form
    1,275.60/1,909.20 = 1,042.64/x
  3. Step 3: Cross multiply
    1,275.60x = 1,909.20 × 1,042.64
  4. Step 4: Simplify right side
    1,275.60x = 1,990,608.29
  5. Step 5: Solve for x
    x = 1,990,608.29/1,275.60
  6. Step 6: Final answer
    x = 1,560.53

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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.