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Finding the Fourth Proportional to 256,910.80, 385,366.20 and 225,806.80

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Solution

The fourth proportional to 256,910.80, 385,366.20 and 225,806.80 is: 338,710.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,910.80 : 385,366.20 = 225,806.80 : x
  2. Step 2: Convert to fraction form
    256,910.80/385,366.20 = 225,806.80/x
  3. Step 3: Cross multiply
    256,910.80x = 385,366.20 × 225,806.80
  4. Step 4: Simplify right side
    256,910.80x = 87,018,308,450.16
  5. Step 5: Solve for x
    x = 87,018,308,450.16/256,910.80
  6. Step 6: Final answer
    x = 338,710.20

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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.