Home / 811,387.20-1,217,080.80-220,411.20

Finding the Fourth Proportional to 811,387.20, 1,217,080.80 and 220,411.20

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Solution

The fourth proportional to 811,387.20, 1,217,080.80 and 220,411.20 is: 330,616.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,387.20 : 1,217,080.80 = 220,411.20 : x
  2. Step 2: Convert to fraction form
    811,387.20/1,217,080.80 = 220,411.20/x
  3. Step 3: Cross multiply
    811,387.20x = 1,217,080.80 × 220,411.20
  4. Step 4: Simplify right side
    811,387.20x = 268,258,239,624.96
  5. Step 5: Solve for x
    x = 268,258,239,624.96/811,387.20
  6. Step 6: Final answer
    x = 330,616.80

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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.