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Finding the Fourth Proportional to 426,828.88, 640,343.89 and 138,639.23

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Solution

The fourth proportional to 426,828.88, 640,343.89 and 138,639.23 is: 207,991.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,828.88 : 640,343.89 = 138,639.23 : x
  2. Step 2: Convert to fraction form
    426,828.88/640,343.89 = 138,639.23/x
  3. Step 3: Cross multiply
    426,828.88x = 640,343.89 × 138,639.23
  4. Step 4: Simplify right side
    426,828.88x = 88,776,782,590.54
  5. Step 5: Solve for x
    x = 88,776,782,590.54/426,828.88
  6. Step 6: Final answer
    x = 207,991.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.