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Finding the Fourth Proportional to 1,221.54, 1,685.76 and 724.18

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Solution

The fourth proportional to 1,221.54, 1,685.76 and 724.18 is: 999.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.54 : 1,685.76 = 724.18 : x
  2. Step 2: Convert to fraction form
    1,221.54/1,685.76 = 724.18/x
  3. Step 3: Cross multiply
    1,221.54x = 1,685.76 × 724.18
  4. Step 4: Simplify right side
    1,221.54x = 1,220,793.68
  5. Step 5: Solve for x
    x = 1,220,793.68/1,221.54
  6. Step 6: Final answer
    x = 999.39

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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.