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Finding the Fourth Proportional to 305,796.80, 458,695.20 and 128,431.10

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Solution

The fourth proportional to 305,796.80, 458,695.20 and 128,431.10 is: 192,646.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,796.80 : 458,695.20 = 128,431.10 : x
  2. Step 2: Convert to fraction form
    305,796.80/458,695.20 = 128,431.10/x
  3. Step 3: Cross multiply
    305,796.80x = 458,695.20 × 128,431.10
  4. Step 4: Simplify right side
    305,796.80x = 58,910,729,100.72
  5. Step 5: Solve for x
    x = 58,910,729,100.72/305,796.80
  6. Step 6: Final answer
    x = 192,646.65

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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.