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Finding the Fourth Proportional to 1,281.90, 1,769.06 and 722.48

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Solution

The fourth proportional to 1,281.90, 1,769.06 and 722.48 is: 997.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.90 : 1,769.06 = 722.48 : x
  2. Step 2: Convert to fraction form
    1,281.90/1,769.06 = 722.48/x
  3. Step 3: Cross multiply
    1,281.90x = 1,769.06 × 722.48
  4. Step 4: Simplify right side
    1,281.90x = 1,278,110.47
  5. Step 5: Solve for x
    x = 1,278,110.47/1,281.90
  6. Step 6: Final answer
    x = 997.04

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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.