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Finding the Fourth Proportional to 399,278.98, 551,002.18 and 217,990.90

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Solution

The fourth proportional to 399,278.98, 551,002.18 and 217,990.90 is: 300,825.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,278.98 : 551,002.18 = 217,990.90 : x
  2. Step 2: Convert to fraction form
    399,278.98/551,002.18 = 217,990.90/x
  3. Step 3: Cross multiply
    399,278.98x = 551,002.18 × 217,990.90
  4. Step 4: Simplify right side
    399,278.98x = 120,113,461,672.67
  5. Step 5: Solve for x
    x = 120,113,461,672.67/399,278.98
  6. Step 6: Final answer
    x = 300,825.91

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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.