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Finding the Fourth Proportional to 520,378.20, 780,640.20 and 220,856.40

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Solution

The fourth proportional to 520,378.20, 780,640.20 and 220,856.40 is: 331,315.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,378.20 : 780,640.20 = 220,856.40 : x
  2. Step 2: Convert to fraction form
    520,378.20/780,640.20 = 220,856.40/x
  3. Step 3: Cross multiply
    520,378.20x = 780,640.20 × 220,856.40
  4. Step 4: Simplify right side
    520,378.20x = 172,409,384,267.28
  5. Step 5: Solve for x
    x = 172,409,384,267.28/520,378.20
  6. Step 6: Final answer
    x = 331,315.54

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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.