Home / 100,390.21-138,519.30-57,383.32

Finding the Fourth Proportional to 100,390.21, 138,519.30 and 57,383.32

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Solution

The fourth proportional to 100,390.21, 138,519.30 and 57,383.32 is: 79,178.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,390.21 : 138,519.30 = 57,383.32 : x
  2. Step 2: Convert to fraction form
    100,390.21/138,519.30 = 57,383.32/x
  3. Step 3: Cross multiply
    100,390.21x = 138,519.30 × 57,383.32
  4. Step 4: Simplify right side
    100,390.21x = 7,948,697,950.37
  5. Step 5: Solve for x
    x = 7,948,697,950.37/100,390.21
  6. Step 6: Final answer
    x = 79,178.02

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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.