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Finding the Fourth Proportional to 318,410.87, 439,589.03 and 211,126.70

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Solution

The fourth proportional to 318,410.87, 439,589.03 and 211,126.70 is: 291,475.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,410.87 : 439,589.03 = 211,126.70 : x
  2. Step 2: Convert to fraction form
    318,410.87/439,589.03 = 211,126.70/x
  3. Step 3: Cross multiply
    318,410.87x = 439,589.03 × 211,126.70
  4. Step 4: Simplify right side
    318,410.87x = 92,808,981,303.44
  5. Step 5: Solve for x
    x = 92,808,981,303.44/318,410.87
  6. Step 6: Final answer
    x = 291,475.55

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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.