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Finding the Fourth Proportional to 1,281.91, 1,769.07 and 722.56

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Solution

The fourth proportional to 1,281.91, 1,769.07 and 722.56 is: 997.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.91 : 1,769.07 = 722.56 : x
  2. Step 2: Convert to fraction form
    1,281.91/1,769.07 = 722.56/x
  3. Step 3: Cross multiply
    1,281.91x = 1,769.07 × 722.56
  4. Step 4: Simplify right side
    1,281.91x = 1,278,259.22
  5. Step 5: Solve for x
    x = 1,278,259.22/1,281.91
  6. Step 6: Final answer
    x = 997.15

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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.