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Finding the Fourth Proportional to 579,940.80, 869,911.20 and 439,972.80

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Solution

The fourth proportional to 579,940.80, 869,911.20 and 439,972.80 is: 659,959.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,940.80 : 869,911.20 = 439,972.80 : x
  2. Step 2: Convert to fraction form
    579,940.80/869,911.20 = 439,972.80/x
  3. Step 3: Cross multiply
    579,940.80x = 869,911.20 × 439,972.80
  4. Step 4: Simplify right side
    579,940.80x = 382,737,266,415.36
  5. Step 5: Solve for x
    x = 382,737,266,415.36/579,940.80
  6. Step 6: Final answer
    x = 659,959.20

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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.