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Finding the Fourth Proportional to 256,939.20, 385,408.80 and 256,939.20

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Solution

The fourth proportional to 256,939.20, 385,408.80 and 256,939.20 is: 385,408.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,939.20 : 385,408.80 = 256,939.20 : x
  2. Step 2: Convert to fraction form
    256,939.20/385,408.80 = 256,939.20/x
  3. Step 3: Cross multiply
    256,939.20x = 385,408.80 × 256,939.20
  4. Step 4: Simplify right side
    256,939.20x = 99,026,628,744.96
  5. Step 5: Solve for x
    x = 99,026,628,744.96/256,939.20
  6. Step 6: Final answer
    x = 385,408.80

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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.