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Finding the Fourth Proportional to 521,071.20, 781,679.70 and 221,549.40

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Solution

The fourth proportional to 521,071.20, 781,679.70 and 221,549.40 is: 332,355.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,071.20 : 781,679.70 = 221,549.40 : x
  2. Step 2: Convert to fraction form
    521,071.20/781,679.70 = 221,549.40/x
  3. Step 3: Cross multiply
    521,071.20x = 781,679.70 × 221,549.40
  4. Step 4: Simplify right side
    521,071.20x = 173,180,668,527.18
  5. Step 5: Solve for x
    x = 173,180,668,527.18/521,071.20
  6. Step 6: Final answer
    x = 332,355.10

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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.