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Finding the Fourth Proportional to 123,540, 170,503.50 and 78,222.20

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Solution

The fourth proportional to 123,540, 170,503.50 and 78,222.20 is: 107,958.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,540 : 170,503.50 = 78,222.20 : x
  2. Step 2: Convert to fraction form
    123,540/170,503.50 = 78,222.20/x
  3. Step 3: Cross multiply
    123,540x = 170,503.50 × 78,222.20
  4. Step 4: Simplify right side
    123,540x = 13,337,158,025.18
  5. Step 5: Solve for x
    x = 13,337,158,025.18/123,540
  6. Step 6: Final answer
    x = 107,958.22

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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.