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Finding the Fourth Proportional to 100,699.72, 138,966.48 and 54,759.51

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Solution

The fourth proportional to 100,699.72, 138,966.48 and 54,759.51 is: 75,568.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,699.72 : 138,966.48 = 54,759.51 : x
  2. Step 2: Convert to fraction form
    100,699.72/138,966.48 = 54,759.51/x
  3. Step 3: Cross multiply
    100,699.72x = 138,966.48 × 54,759.51
  4. Step 4: Simplify right side
    100,699.72x = 7,609,736,351.22
  5. Step 5: Solve for x
    x = 7,609,736,351.22/100,699.72
  6. Step 6: Final answer
    x = 75,568.60

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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.