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Finding the Fourth Proportional to 1,282.59, 1,769.88 and 723.09

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Solution

The fourth proportional to 1,282.59, 1,769.88 and 723.09 is: 997.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.59 : 1,769.88 = 723.09 : x
  2. Step 2: Convert to fraction form
    1,282.59/1,769.88 = 723.09/x
  3. Step 3: Cross multiply
    1,282.59x = 1,769.88 × 723.09
  4. Step 4: Simplify right side
    1,282.59x = 1,279,782.53
  5. Step 5: Solve for x
    x = 1,279,782.53/1,282.59
  6. Step 6: Final answer
    x = 997.81

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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.