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Finding the Fourth Proportional to 100,201, 138,277.38 and 55,489

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Solution

The fourth proportional to 100,201, 138,277.38 and 55,489 is: 76,574.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,201 : 138,277.38 = 55,489 : x
  2. Step 2: Convert to fraction form
    100,201/138,277.38 = 55,489/x
  3. Step 3: Cross multiply
    100,201x = 138,277.38 × 55,489
  4. Step 4: Simplify right side
    100,201x = 7,672,873,538.82
  5. Step 5: Solve for x
    x = 7,672,873,538.82/100,201
  6. Step 6: Final answer
    x = 76,574.82

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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.