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Finding the Fourth Proportional to 391,847.70, 540,339.21 and 290,086.59

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Solution

The fourth proportional to 391,847.70, 540,339.21 and 290,086.59 is: 400,015.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,847.70 : 540,339.21 = 290,086.59 : x
  2. Step 2: Convert to fraction form
    391,847.70/540,339.21 = 290,086.59/x
  3. Step 3: Cross multiply
    391,847.70x = 540,339.21 × 290,086.59
  4. Step 4: Simplify right side
    391,847.70x = 156,745,158,872.19
  5. Step 5: Solve for x
    x = 156,745,158,872.19/391,847.70
  6. Step 6: Final answer
    x = 400,015.51

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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.