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Finding the Fourth Proportional to 399,503.70, 551,311.38 and 218,215.56

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Solution

The fourth proportional to 399,503.70, 551,311.38 and 218,215.56 is: 301,135.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,503.70 : 551,311.38 = 218,215.56 : x
  2. Step 2: Convert to fraction form
    399,503.70/551,311.38 = 218,215.56/x
  3. Step 3: Cross multiply
    399,503.70x = 551,311.38 × 218,215.56
  4. Step 4: Simplify right side
    399,503.70x = 120,304,721,521.07
  5. Step 5: Solve for x
    x = 120,304,721,521.07/399,503.70
  6. Step 6: Final answer
    x = 301,135.44

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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.