Home / 100,217.09-138,301.80-57,195.72

Finding the Fourth Proportional to 100,217.09, 138,301.80 and 57,195.72

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Solution

The fourth proportional to 100,217.09, 138,301.80 and 57,195.72 is: 78,931.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,217.09 : 138,301.80 = 57,195.72 : x
  2. Step 2: Convert to fraction form
    100,217.09/138,301.80 = 57,195.72/x
  3. Step 3: Cross multiply
    100,217.09x = 138,301.80 × 57,195.72
  4. Step 4: Simplify right side
    100,217.09x = 7,910,271,028.30
  5. Step 5: Solve for x
    x = 7,910,271,028.30/100,217.09
  6. Step 6: Final answer
    x = 78,931.36

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1.5x scale

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.