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Finding the Fourth Proportional to 642,172.88, 886,198.55 and 355,711.42

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Solution

The fourth proportional to 642,172.88, 886,198.55 and 355,711.42 is: 490,881.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,172.88 : 886,198.55 = 355,711.42 : x
  2. Step 2: Convert to fraction form
    642,172.88/886,198.55 = 355,711.42/x
  3. Step 3: Cross multiply
    642,172.88x = 886,198.55 × 355,711.42
  4. Step 4: Simplify right side
    642,172.88x = 315,230,944,622.44
  5. Step 5: Solve for x
    x = 315,230,944,622.44/642,172.88
  6. Step 6: Final answer
    x = 490,881.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.