Home / 100,136.12-138,204.78-57,719.30

Finding the Fourth Proportional to 100,136.12, 138,204.78 and 57,719.30

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Solution

The fourth proportional to 100,136.12, 138,204.78 and 57,719.30 is: 79,662.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,136.12 : 138,204.78 = 57,719.30 : x
  2. Step 2: Convert to fraction form
    100,136.12/138,204.78 = 57,719.30/x
  3. Step 3: Cross multiply
    100,136.12x = 138,204.78 × 57,719.30
  4. Step 4: Simplify right side
    100,136.12x = 7,977,083,158.25
  5. Step 5: Solve for x
    x = 7,977,083,158.25/100,136.12
  6. Step 6: Final answer
    x = 79,662.40

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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.