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Finding the Fourth Proportional to 256,939.20, 385,466.40 and 79,454.40

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Solution

The fourth proportional to 256,939.20, 385,466.40 and 79,454.40 is: 119,199.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,939.20 : 385,466.40 = 79,454.40 : x
  2. Step 2: Convert to fraction form
    256,939.20/385,466.40 = 79,454.40/x
  3. Step 3: Cross multiply
    256,939.20x = 385,466.40 × 79,454.40
  4. Step 4: Simplify right side
    256,939.20x = 30,627,001,532.16
  5. Step 5: Solve for x
    x = 30,627,001,532.16/256,939.20
  6. Step 6: Final answer
    x = 119,199.41

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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.