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Finding the Fourth Proportional to 318,215.76, 439,230.78 and 189,244.92

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Solution

The fourth proportional to 318,215.76, 439,230.78 and 189,244.92 is: 261,213.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,215.76 : 439,230.78 = 189,244.92 : x
  2. Step 2: Convert to fraction form
    318,215.76/439,230.78 = 189,244.92/x
  3. Step 3: Cross multiply
    318,215.76x = 439,230.78 × 189,244.92
  4. Step 4: Simplify right side
    318,215.76x = 83,122,193,822.64
  5. Step 5: Solve for x
    x = 83,122,193,822.64/318,215.76
  6. Step 6: Final answer
    x = 261,213.32

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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.