Home / 100,497.21-138,686.39-55,178.11

Finding the Fourth Proportional to 100,497.21, 138,686.39 and 55,178.11

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Solution

The fourth proportional to 100,497.21, 138,686.39 and 55,178.11 is: 76,145.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,497.21 : 138,686.39 = 55,178.11 : x
  2. Step 2: Convert to fraction form
    100,497.21/138,686.39 = 55,178.11/x
  3. Step 3: Cross multiply
    100,497.21x = 138,686.39 × 55,178.11
  4. Step 4: Simplify right side
    100,497.21x = 7,652,452,882.92
  5. Step 5: Solve for x
    x = 7,652,452,882.92/100,497.21
  6. Step 6: Final answer
    x = 76,145.92

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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.