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Finding the Fourth Proportional to 256,500.40, 384,750.60 and 209,261.20

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Solution

The fourth proportional to 256,500.40, 384,750.60 and 209,261.20 is: 313,891.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,500.40 : 384,750.60 = 209,261.20 : x
  2. Step 2: Convert to fraction form
    256,500.40/384,750.60 = 209,261.20/x
  3. Step 3: Cross multiply
    256,500.40x = 384,750.60 × 209,261.20
  4. Step 4: Simplify right side
    256,500.40x = 80,513,372,256.72
  5. Step 5: Solve for x
    x = 80,513,372,256.72/256,500.40
  6. Step 6: Final answer
    x = 313,891.80

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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.