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Finding the Fourth Proportional to 391,366.40, 540,355.20 and 289,414.40

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Solution

The fourth proportional to 391,366.40, 540,355.20 and 289,414.40 is: 399,591.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,366.40 : 540,355.20 = 289,414.40 : x
  2. Step 2: Convert to fraction form
    391,366.40/540,355.20 = 289,414.40/x
  3. Step 3: Cross multiply
    391,366.40x = 540,355.20 × 289,414.40
  4. Step 4: Simplify right side
    391,366.40x = 156,386,575,994.88
  5. Step 5: Solve for x
    x = 156,386,575,994.88/391,366.40
  6. Step 6: Final answer
    x = 399,591.22

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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.