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Finding the Fourth Proportional to 399,307.30, 551,045.22 and 218,020.79

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Solution

The fourth proportional to 399,307.30, 551,045.22 and 218,020.79 is: 300,869.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,307.30 : 551,045.22 = 218,020.79 : x
  2. Step 2: Convert to fraction form
    399,307.30/551,045.22 = 218,020.79/x
  3. Step 3: Cross multiply
    399,307.30x = 551,045.22 × 218,020.79
  4. Step 4: Simplify right side
    399,307.30x = 120,139,314,190.12
  5. Step 5: Solve for x
    x = 120,139,314,190.12/399,307.30
  6. Step 6: Final answer
    x = 300,869.32

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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.