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Finding the Fourth Proportional to 1,282.02, 1,769.45 and 839.76

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Solution

The fourth proportional to 1,282.02, 1,769.45 and 839.76 is: 1,159.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.02 : 1,769.45 = 839.76 : x
  2. Step 2: Convert to fraction form
    1,282.02/1,769.45 = 839.76/x
  3. Step 3: Cross multiply
    1,282.02x = 1,769.45 × 839.76
  4. Step 4: Simplify right side
    1,282.02x = 1,485,909.13
  5. Step 5: Solve for x
    x = 1,485,909.13/1,282.02
  6. Step 6: Final answer
    x = 1,159.04

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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.