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Finding the Fourth Proportional to 171,353.90, 256,846.98 and 71,438.78

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Solution

The fourth proportional to 171,353.90, 256,846.98 and 71,438.78 is: 107,081.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,353.90 : 256,846.98 = 71,438.78 : x
  2. Step 2: Convert to fraction form
    171,353.90/256,846.98 = 71,438.78/x
  3. Step 3: Cross multiply
    171,353.90x = 256,846.98 × 71,438.78
  4. Step 4: Simplify right side
    171,353.90x = 18,348,834,897.88
  5. Step 5: Solve for x
    x = 18,348,834,897.88/171,353.90
  6. Step 6: Final answer
    x = 107,081.51

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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.