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Finding the Fourth Proportional to 521,130.40, 781,695.60 and 221,535.70

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Solution

The fourth proportional to 521,130.40, 781,695.60 and 221,535.70 is: 332,303.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,130.40 : 781,695.60 = 221,535.70 : x
  2. Step 2: Convert to fraction form
    521,130.40/781,695.60 = 221,535.70/x
  3. Step 3: Cross multiply
    521,130.40x = 781,695.60 × 221,535.70
  4. Step 4: Simplify right side
    521,130.40x = 173,173,481,932.92
  5. Step 5: Solve for x
    x = 173,173,481,932.92/521,130.40
  6. Step 6: Final answer
    x = 332,303.55

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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.