Home / 721,121.37-995,061.19-398,787.69

Finding the Fourth Proportional to 721,121.37, 995,061.19 and 398,787.69

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Solution

The fourth proportional to 721,121.37, 995,061.19 and 398,787.69 is: 550,279.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,121.37 : 995,061.19 = 398,787.69 : x
  2. Step 2: Convert to fraction form
    721,121.37/995,061.19 = 398,787.69/x
  3. Step 3: Cross multiply
    721,121.37x = 995,061.19 × 398,787.69
  4. Step 4: Simplify right side
    721,121.37x = 396,818,151,374.81
  5. Step 5: Solve for x
    x = 396,818,151,374.81/721,121.37
  6. Step 6: Final answer
    x = 550,279.28

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Double scale
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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.