Home / 521,106.90-781,660.35-221,512.20

Finding the Fourth Proportional to 521,106.90, 781,660.35 and 221,512.20

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Solution

The fourth proportional to 521,106.90, 781,660.35 and 221,512.20 is: 332,268.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,106.90 : 781,660.35 = 221,512.20 : x
  2. Step 2: Convert to fraction form
    521,106.90/781,660.35 = 221,512.20/x
  3. Step 3: Cross multiply
    521,106.90x = 781,660.35 × 221,512.20
  4. Step 4: Simplify right side
    521,106.90x = 173,147,303,781.27
  5. Step 5: Solve for x
    x = 173,147,303,781.27/521,106.90
  6. Step 6: Final answer
    x = 332,268.30

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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.