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Finding the Fourth Proportional to 399,018.06, 550,658.21 and 217,739.93

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Solution

The fourth proportional to 399,018.06, 550,658.21 and 217,739.93 is: 300,488.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,018.06 : 550,658.21 = 217,739.93 : x
  2. Step 2: Convert to fraction form
    399,018.06/550,658.21 = 217,739.93/x
  3. Step 3: Cross multiply
    399,018.06x = 550,658.21 × 217,739.93
  4. Step 4: Simplify right side
    399,018.06x = 119,900,276,257.34
  5. Step 5: Solve for x
    x = 119,900,276,257.34/399,018.06
  6. Step 6: Final answer
    x = 300,488.34

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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.