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Finding the Fourth Proportional to 431,379.80, 647,069.70 and 355,272.20

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Solution

The fourth proportional to 431,379.80, 647,069.70 and 355,272.20 is: 532,908.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,379.80 : 647,069.70 = 355,272.20 : x
  2. Step 2: Convert to fraction form
    431,379.80/647,069.70 = 355,272.20/x
  3. Step 3: Cross multiply
    431,379.80x = 647,069.70 × 355,272.20
  4. Step 4: Simplify right side
    431,379.80x = 229,885,875,872.34
  5. Step 5: Solve for x
    x = 229,885,875,872.34/431,379.80
  6. Step 6: Final answer
    x = 532,908.30

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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.