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Finding the Fourth Proportional to 821.72, 1,226.57 and 724.52

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Solution

The fourth proportional to 821.72, 1,226.57 and 724.52 is: 1,081.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.72 : 1,226.57 = 724.52 : x
  2. Step 2: Convert to fraction form
    821.72/1,226.57 = 724.52/x
  3. Step 3: Cross multiply
    821.72x = 1,226.57 × 724.52
  4. Step 4: Simplify right side
    821.72x = 888,674.50
  5. Step 5: Solve for x
    x = 888,674.50/821.72
  6. Step 6: Final answer
    x = 1,081.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.