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Finding the Fourth Proportional to 1,282.86, 1,769.63 and 810.61

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Solution

The fourth proportional to 1,282.86, 1,769.63 and 810.61 is: 1,118.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.86 : 1,769.63 = 810.61 : x
  2. Step 2: Convert to fraction form
    1,282.86/1,769.63 = 810.61/x
  3. Step 3: Cross multiply
    1,282.86x = 1,769.63 × 810.61
  4. Step 4: Simplify right side
    1,282.86x = 1,434,471.30
  5. Step 5: Solve for x
    x = 1,434,471.30/1,282.86
  6. Step 6: Final answer
    x = 1,118.18

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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.