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Finding the Fourth Proportional to 100,688.97, 138,959.63 and 55,374.93

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Solution

The fourth proportional to 100,688.97, 138,959.63 and 55,374.93 is: 76,422.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,688.97 : 138,959.63 = 55,374.93 : x
  2. Step 2: Convert to fraction form
    100,688.97/138,959.63 = 55,374.93/x
  3. Step 3: Cross multiply
    100,688.97x = 138,959.63 × 55,374.93
  4. Step 4: Simplify right side
    100,688.97x = 7,694,879,507.20
  5. Step 5: Solve for x
    x = 7,694,879,507.20/100,688.97
  6. Step 6: Final answer
    x = 76,422.27

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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.