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Finding the Third Proportional to 91,890.75 and 139,221.75

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Solution

The third proportional to 91,890.75 and 139,221.75 is: 210,931.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,890.75 : 139,221.75 = 139,221.75 : x
  2. Step 2: Convert to fraction form
    91,890.75/139,221.75 = 139,221.75/x
  3. Step 3: Cross multiply
    91,890.75x = 139,221.75 × 139,221.75
  4. Step 4: Simplify right side
    91,890.75x = 19,382,695,673.06
  5. Step 5: Solve for x
    x = 19,382,695,673.06/91,890.75
  6. Step 6: Final answer
    x = 210,931.96

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.