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Finding the Fourth Proportional to 256,491.40, 384,429.90 and 131,768.20

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Solution

The fourth proportional to 256,491.40, 384,429.90 and 131,768.20 is: 197,494.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,491.40 : 384,429.90 = 131,768.20 : x
  2. Step 2: Convert to fraction form
    256,491.40/384,429.90 = 131,768.20/x
  3. Step 3: Cross multiply
    256,491.40x = 384,429.90 × 131,768.20
  4. Step 4: Simplify right side
    256,491.40x = 50,655,635,949.18
  5. Step 5: Solve for x
    x = 50,655,635,949.18/256,491.40
  6. Step 6: Final answer
    x = 197,494.48

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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.