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Finding the Fourth Proportional to 513,139.80, 768,834.90 and 423,910.20

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Solution

The fourth proportional to 513,139.80, 768,834.90 and 423,910.20 is: 635,142.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,139.80 : 768,834.90 = 423,910.20 : x
  2. Step 2: Convert to fraction form
    513,139.80/768,834.90 = 423,910.20/x
  3. Step 3: Cross multiply
    513,139.80x = 768,834.90 × 423,910.20
  4. Step 4: Simplify right side
    513,139.80x = 325,916,956,225.98
  5. Step 5: Solve for x
    x = 325,916,956,225.98/513,139.80
  6. Step 6: Final answer
    x = 635,142.62

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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.