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Finding the Fourth Proportional to 254,439.40, 381,659.10 and 128,468.20

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Solution

The fourth proportional to 254,439.40, 381,659.10 and 128,468.20 is: 192,702.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    254,439.40 : 381,659.10 = 128,468.20 : x
  2. Step 2: Convert to fraction form
    254,439.40/381,659.10 = 128,468.20/x
  3. Step 3: Cross multiply
    254,439.40x = 381,659.10 × 128,468.20
  4. Step 4: Simplify right side
    254,439.40x = 49,031,057,590.62
  5. Step 5: Solve for x
    x = 49,031,057,590.62/254,439.40
  6. Step 6: Final answer
    x = 192,702.30

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Similar ratio
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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.