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Finding the Fourth Proportional to 664,519.80, 996,779.70 and 428,129.40

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Solution

The fourth proportional to 664,519.80, 996,779.70 and 428,129.40 is: 642,194.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,519.80 : 996,779.70 = 428,129.40 : x
  2. Step 2: Convert to fraction form
    664,519.80/996,779.70 = 428,129.40/x
  3. Step 3: Cross multiply
    664,519.80x = 996,779.70 × 428,129.40
  4. Step 4: Simplify right side
    664,519.80x = 426,750,694,893.18
  5. Step 5: Solve for x
    x = 426,750,694,893.18/664,519.80
  6. Step 6: Final answer
    x = 642,194.10

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Similar ratio
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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.