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Finding the Fourth Proportional to 256,872.40, 385,309.80 and 90,660.40

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Solution

The fourth proportional to 256,872.40, 385,309.80 and 90,660.40 is: 135,991.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,872.40 : 385,309.80 = 90,660.40 : x
  2. Step 2: Convert to fraction form
    256,872.40/385,309.80 = 90,660.40/x
  3. Step 3: Cross multiply
    256,872.40x = 385,309.80 × 90,660.40
  4. Step 4: Simplify right side
    256,872.40x = 34,932,340,591.92
  5. Step 5: Solve for x
    x = 34,932,340,591.92/256,872.40
  6. Step 6: Final answer
    x = 135,991.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.