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Finding the Fourth Proportional to 68,549.88, 102,786.61 and 21,151.51

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Solution

The fourth proportional to 68,549.88, 102,786.61 and 21,151.51 is: 31,715.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,549.88 : 102,786.61 = 21,151.51 : x
  2. Step 2: Convert to fraction form
    68,549.88/102,786.61 = 21,151.51/x
  3. Step 3: Cross multiply
    68,549.88x = 102,786.61 × 21,151.51
  4. Step 4: Simplify right side
    68,549.88x = 2,174,092,009.28
  5. Step 5: Solve for x
    x = 2,174,092,009.28/68,549.88
  6. Step 6: Final answer
    x = 31,715.48

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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.