Home / 638,630.16-880,979.80-396,820.88

Finding the Fourth Proportional to 638,630.16, 880,979.80 and 396,820.88

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Solution

The fourth proportional to 638,630.16, 880,979.80 and 396,820.88 is: 547,407.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,630.16 : 880,979.80 = 396,820.88 : x
  2. Step 2: Convert to fraction form
    638,630.16/880,979.80 = 396,820.88/x
  3. Step 3: Cross multiply
    638,630.16x = 880,979.80 × 396,820.88
  4. Step 4: Simplify right side
    638,630.16x = 349,591,179,498.22
  5. Step 5: Solve for x
    x = 349,591,179,498.22/638,630.16
  6. Step 6: Final answer
    x = 547,407.88

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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.