Home / 381,981.12-527,132.18-209,909.78

Finding the Fourth Proportional to 381,981.12, 527,132.18 and 209,909.78

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Solution

The fourth proportional to 381,981.12, 527,132.18 and 209,909.78 is: 289,674.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,981.12 : 527,132.18 = 209,909.78 : x
  2. Step 2: Convert to fraction form
    381,981.12/527,132.18 = 209,909.78/x
  3. Step 3: Cross multiply
    381,981.12x = 527,132.18 × 209,909.78
  4. Step 4: Simplify right side
    381,981.12x = 110,650,199,934.72
  5. Step 5: Solve for x
    x = 110,650,199,934.72/381,981.12
  6. Step 6: Final answer
    x = 289,674.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.