Home / 287,974.20-431,961.30-257,647.80

Finding the Fourth Proportional to 287,974.20, 431,961.30 and 257,647.80

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Solution

The fourth proportional to 287,974.20, 431,961.30 and 257,647.80 is: 386,471.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,974.20 : 431,961.30 = 257,647.80 : x
  2. Step 2: Convert to fraction form
    287,974.20/431,961.30 = 257,647.80/x
  3. Step 3: Cross multiply
    287,974.20x = 431,961.30 × 257,647.80
  4. Step 4: Simplify right side
    287,974.20x = 111,293,878,630.14
  5. Step 5: Solve for x
    x = 111,293,878,630.14/287,974.20
  6. Step 6: Final answer
    x = 386,471.70

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.