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Finding the Fourth Proportional to 520,381.20, 780,644.70 and 220,859.40

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Solution

The fourth proportional to 520,381.20, 780,644.70 and 220,859.40 is: 331,320.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,381.20 : 780,644.70 = 220,859.40 : x
  2. Step 2: Convert to fraction form
    520,381.20/780,644.70 = 220,859.40/x
  3. Step 3: Cross multiply
    520,381.20x = 780,644.70 × 220,859.40
  4. Step 4: Simplify right side
    520,381.20x = 172,412,720,055.18
  5. Step 5: Solve for x
    x = 172,412,720,055.18/520,381.20
  6. Step 6: Final answer
    x = 331,320.04

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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.