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Finding the Fourth Proportional to 68,708.45, 103,077.39 and 21,322.51

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Solution

The fourth proportional to 68,708.45, 103,077.39 and 21,322.51 is: 31,988.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,708.45 : 103,077.39 = 21,322.51 : x
  2. Step 2: Convert to fraction form
    68,708.45/103,077.39 = 21,322.51/x
  3. Step 3: Cross multiply
    68,708.45x = 103,077.39 × 21,322.51
  4. Step 4: Simplify right side
    68,708.45x = 2,197,868,501.31
  5. Step 5: Solve for x
    x = 2,197,868,501.31/68,708.45
  6. Step 6: Final answer
    x = 31,988.33

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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.