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Finding the Fourth Proportional to 521,015.20, 781,522.80 and 311,063.20

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Solution

The fourth proportional to 521,015.20, 781,522.80 and 311,063.20 is: 466,594.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,015.20 : 781,522.80 = 311,063.20 : x
  2. Step 2: Convert to fraction form
    521,015.20/781,522.80 = 311,063.20/x
  3. Step 3: Cross multiply
    521,015.20x = 781,522.80 × 311,063.20
  4. Step 4: Simplify right side
    521,015.20x = 243,102,983,040.96
  5. Step 5: Solve for x
    x = 243,102,983,040.96/521,015.20
  6. Step 6: Final answer
    x = 466,594.80

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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.