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Finding the Fourth Proportional to 256,147.20, 384,220.80 and 138,049.20

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Solution

The fourth proportional to 256,147.20, 384,220.80 and 138,049.20 is: 207,073.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,147.20 : 384,220.80 = 138,049.20 : x
  2. Step 2: Convert to fraction form
    256,147.20/384,220.80 = 138,049.20/x
  3. Step 3: Cross multiply
    256,147.20x = 384,220.80 × 138,049.20
  4. Step 4: Simplify right side
    256,147.20x = 53,041,374,063.36
  5. Step 5: Solve for x
    x = 53,041,374,063.36/256,147.20
  6. Step 6: Final answer
    x = 207,073.80

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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.