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Finding the Fourth Proportional to 426,388.52, 639,573.99 and 142,099.71

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Solution

The fourth proportional to 426,388.52, 639,573.99 and 142,099.71 is: 213,146.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,388.52 : 639,573.99 = 142,099.71 : x
  2. Step 2: Convert to fraction form
    426,388.52/639,573.99 = 142,099.71/x
  3. Step 3: Cross multiply
    426,388.52x = 639,573.99 × 142,099.71
  4. Step 4: Simplify right side
    426,388.52x = 90,883,278,502.54
  5. Step 5: Solve for x
    x = 90,883,278,502.54/426,388.52
  6. Step 6: Final answer
    x = 213,146.64

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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.