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Finding the Fourth Proportional to 1,275.80, 1,909.38 and 763.16

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Solution

The fourth proportional to 1,275.80, 1,909.38 and 763.16 is: 1,142.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.80 : 1,909.38 = 763.16 : x
  2. Step 2: Convert to fraction form
    1,275.80/1,909.38 = 763.16/x
  3. Step 3: Cross multiply
    1,275.80x = 1,909.38 × 763.16
  4. Step 4: Simplify right side
    1,275.80x = 1,457,162.44
  5. Step 5: Solve for x
    x = 1,457,162.44/1,275.80
  6. Step 6: Final answer
    x = 1,142.16

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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.