Home / 678,220.80-1,017,331.20-412,502.40

Finding the Fourth Proportional to 678,220.80, 1,017,331.20 and 412,502.40

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Solution

The fourth proportional to 678,220.80, 1,017,331.20 and 412,502.40 is: 618,753.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,220.80 : 1,017,331.20 = 412,502.40 : x
  2. Step 2: Convert to fraction form
    678,220.80/1,017,331.20 = 412,502.40/x
  3. Step 3: Cross multiply
    678,220.80x = 1,017,331.20 × 412,502.40
  4. Step 4: Simplify right side
    678,220.80x = 419,651,561,594.88
  5. Step 5: Solve for x
    x = 419,651,561,594.88/678,220.80
  6. Step 6: Final answer
    x = 618,753.60

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Double scale
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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.