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Finding the Fourth Proportional to 485,786.40, 728,679.60 and 434,610.60

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Solution

The fourth proportional to 485,786.40, 728,679.60 and 434,610.60 is: 651,915.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,786.40 : 728,679.60 = 434,610.60 : x
  2. Step 2: Convert to fraction form
    485,786.40/728,679.60 = 434,610.60/x
  3. Step 3: Cross multiply
    485,786.40x = 728,679.60 × 434,610.60
  4. Step 4: Simplify right side
    485,786.40x = 316,691,878,163.76
  5. Step 5: Solve for x
    x = 316,691,878,163.76/485,786.40
  6. Step 6: Final answer
    x = 651,915.90

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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.