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Finding the Fourth Proportional to 1,276.24, 1,760.80 and 803.92

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Solution

The fourth proportional to 1,276.24, 1,760.80 and 803.92 is: 1,109.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.24 : 1,760.80 = 803.92 : x
  2. Step 2: Convert to fraction form
    1,276.24/1,760.80 = 803.92/x
  3. Step 3: Cross multiply
    1,276.24x = 1,760.80 × 803.92
  4. Step 4: Simplify right side
    1,276.24x = 1,415,542.34
  5. Step 5: Solve for x
    x = 1,415,542.34/1,276.24
  6. Step 6: Final answer
    x = 1,109.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.