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Finding the Fourth Proportional to 485,679.60, 728,519.40 and 438,440.40

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Solution

The fourth proportional to 485,679.60, 728,519.40 and 438,440.40 is: 657,660.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,679.60 : 728,519.40 = 438,440.40 : x
  2. Step 2: Convert to fraction form
    485,679.60/728,519.40 = 438,440.40/x
  3. Step 3: Cross multiply
    485,679.60x = 728,519.40 × 438,440.40
  4. Step 4: Simplify right side
    485,679.60x = 319,412,337,143.76
  5. Step 5: Solve for x
    x = 319,412,337,143.76/485,679.60
  6. Step 6: Final answer
    x = 657,660.60

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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.