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Finding the Fourth Proportional to 68,321.51, 102,470.64 and 18,390.48

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Solution

The fourth proportional to 68,321.51, 102,470.64 and 18,390.48 is: 27,582.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,321.51 : 102,470.64 = 18,390.48 : x
  2. Step 2: Convert to fraction form
    68,321.51/102,470.64 = 18,390.48/x
  3. Step 3: Cross multiply
    68,321.51x = 102,470.64 × 18,390.48
  4. Step 4: Simplify right side
    68,321.51x = 1,884,484,255.51
  5. Step 5: Solve for x
    x = 1,884,484,255.51/68,321.51
  6. Step 6: Final answer
    x = 27,582.59

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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.