Home / 811,505.80-1,217,258.70-390,680.20

Finding the Fourth Proportional to 811,505.80, 1,217,258.70 and 390,680.20

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Solution

The fourth proportional to 811,505.80, 1,217,258.70 and 390,680.20 is: 586,020.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,505.80 : 1,217,258.70 = 390,680.20 : x
  2. Step 2: Convert to fraction form
    811,505.80/1,217,258.70 = 390,680.20/x
  3. Step 3: Cross multiply
    811,505.80x = 1,217,258.70 × 390,680.20
  4. Step 4: Simplify right side
    811,505.80x = 475,558,872,367.74
  5. Step 5: Solve for x
    x = 475,558,872,367.74/811,505.80
  6. Step 6: Final answer
    x = 586,020.30

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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.