Home / 81,309.78-121,964.69-53,601.30

Finding the Fourth Proportional to 81,309.78, 121,964.69 and 53,601.30

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Solution

The fourth proportional to 81,309.78, 121,964.69 and 53,601.30 is: 80,401.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,309.78 : 121,964.69 = 53,601.30 : x
  2. Step 2: Convert to fraction form
    81,309.78/121,964.69 = 53,601.30/x
  3. Step 3: Cross multiply
    81,309.78x = 121,964.69 × 53,601.30
  4. Step 4: Simplify right side
    81,309.78x = 6,537,465,938.10
  5. Step 5: Solve for x
    x = 6,537,465,938.10/81,309.78
  6. Step 6: Final answer
    x = 80,401.96

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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.