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Finding the Fourth Proportional to 122,417.20, 183,625.80 and 72,650.80

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Solution

The fourth proportional to 122,417.20, 183,625.80 and 72,650.80 is: 108,976.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,417.20 : 183,625.80 = 72,650.80 : x
  2. Step 2: Convert to fraction form
    122,417.20/183,625.80 = 72,650.80/x
  3. Step 3: Cross multiply
    122,417.20x = 183,625.80 × 72,650.80
  4. Step 4: Simplify right side
    122,417.20x = 13,340,561,270.64
  5. Step 5: Solve for x
    x = 13,340,561,270.64/122,417.20
  6. Step 6: Final answer
    x = 108,976.20

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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.