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Finding the Fourth Proportional to 123,072, 169,840.08 and 72,114.80

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Solution

The fourth proportional to 123,072, 169,840.08 and 72,114.80 is: 99,518.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,072 : 169,840.08 = 72,114.80 : x
  2. Step 2: Convert to fraction form
    123,072/169,840.08 = 72,114.80/x
  3. Step 3: Cross multiply
    123,072x = 169,840.08 × 72,114.80
  4. Step 4: Simplify right side
    123,072x = 12,247,983,401.18
  5. Step 5: Solve for x
    x = 12,247,983,401.18/123,072
  6. Step 6: Final answer
    x = 99,518.85

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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.