Home / 91,138.68-136,927.26-86,103.72

Finding the Fourth Proportional to 91,138.68, 136,927.26 and 86,103.72

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Solution

The fourth proportional to 91,138.68, 136,927.26 and 86,103.72 is: 129,362.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,138.68 : 136,927.26 = 86,103.72 : x
  2. Step 2: Convert to fraction form
    91,138.68/136,927.26 = 86,103.72/x
  3. Step 3: Cross multiply
    91,138.68x = 136,927.26 × 86,103.72
  4. Step 4: Simplify right side
    91,138.68x = 11,789,946,455.41
  5. Step 5: Solve for x
    x = 11,789,946,455.41/91,138.68
  6. Step 6: Final answer
    x = 129,362.71

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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.