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Finding the Fourth Proportional to 625,879.71, 863,343.97 and 399,525.21

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Solution

The fourth proportional to 625,879.71, 863,343.97 and 399,525.21 is: 551,108.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    625,879.71 : 863,343.97 = 399,525.21 : x
  2. Step 2: Convert to fraction form
    625,879.71/863,343.97 = 399,525.21/x
  3. Step 3: Cross multiply
    625,879.71x = 863,343.97 × 399,525.21
  4. Step 4: Simplify right side
    625,879.71x = 344,927,679,917.67
  5. Step 5: Solve for x
    x = 344,927,679,917.67/625,879.71
  6. Step 6: Final answer
    x = 551,108.58

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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.