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Finding the Fourth Proportional to 399,178.24, 550,879.31 and 217,900.91

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Solution

The fourth proportional to 399,178.24, 550,879.31 and 217,900.91 is: 300,710.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,178.24 : 550,879.31 = 217,900.91 : x
  2. Step 2: Convert to fraction form
    399,178.24/550,879.31 = 217,900.91/x
  3. Step 3: Cross multiply
    399,178.24x = 550,879.31 × 217,900.91
  4. Step 4: Simplify right side
    399,178.24x = 120,037,102,949.17
  5. Step 5: Solve for x
    x = 120,037,102,949.17/399,178.24
  6. Step 6: Final answer
    x = 300,710.54

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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.