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Finding the Fourth Proportional to 399,417, 551,199.87 and 218,134.27

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Solution

The fourth proportional to 399,417, 551,199.87 and 218,134.27 is: 301,027.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,417 : 551,199.87 = 218,134.27 : x
  2. Step 2: Convert to fraction form
    399,417/551,199.87 = 218,134.27/x
  3. Step 3: Cross multiply
    399,417x = 551,199.87 × 218,134.27
  4. Step 4: Simplify right side
    399,417x = 120,235,581,266.55
  5. Step 5: Solve for x
    x = 120,235,581,266.55/399,417
  6. Step 6: Final answer
    x = 301,027.70

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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.