Home / 100,620.28-138,857.25-55,303.21

Finding the Fourth Proportional to 100,620.28, 138,857.25 and 55,303.21

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Solution

The fourth proportional to 100,620.28, 138,857.25 and 55,303.21 is: 76,319.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,620.28 : 138,857.25 = 55,303.21 : x
  2. Step 2: Convert to fraction form
    100,620.28/138,857.25 = 55,303.21/x
  3. Step 3: Cross multiply
    100,620.28x = 138,857.25 × 55,303.21
  4. Step 4: Simplify right side
    100,620.28x = 7,679,251,656.77
  5. Step 5: Solve for x
    x = 7,679,251,656.77/100,620.28
  6. Step 6: Final answer
    x = 76,319.12

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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.