Home / 81,389.40-121,894.56-79,147.20

Finding the Fourth Proportional to 81,389.40, 121,894.56 and 79,147.20

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Solution

The fourth proportional to 81,389.40, 121,894.56 and 79,147.20 is: 118,536.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,389.40 : 121,894.56 = 79,147.20 : x
  2. Step 2: Convert to fraction form
    81,389.40/121,894.56 = 79,147.20/x
  3. Step 3: Cross multiply
    81,389.40x = 121,894.56 × 79,147.20
  4. Step 4: Simplify right side
    81,389.40x = 9,647,613,119.23
  5. Step 5: Solve for x
    x = 9,647,613,119.23/81,389.40
  6. Step 6: Final answer
    x = 118,536.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.