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Finding the Fourth Proportional to 123,897.78, 170,981.01 and 67,309.20

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Solution

The fourth proportional to 123,897.78, 170,981.01 and 67,309.20 is: 92,887.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,897.78 : 170,981.01 = 67,309.20 : x
  2. Step 2: Convert to fraction form
    123,897.78/170,981.01 = 67,309.20/x
  3. Step 3: Cross multiply
    123,897.78x = 170,981.01 × 67,309.20
  4. Step 4: Simplify right side
    123,897.78x = 11,508,594,998.29
  5. Step 5: Solve for x
    x = 11,508,594,998.29/123,897.78
  6. Step 6: Final answer
    x = 92,887.82

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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.