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Finding the Third Proportional to 5,091 and 7,981.50

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Solution

The third proportional to 5,091 and 7,981.50 is: 12,513.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,091 : 7,981.50 = 7,981.50 : x
  2. Step 2: Convert to fraction form
    5,091/7,981.50 = 7,981.50/x
  3. Step 3: Cross multiply
    5,091x = 7,981.50 × 7,981.50
  4. Step 4: Simplify right side
    5,091x = 63,704,342.25
  5. Step 5: Solve for x
    x = 63,704,342.25/5,091
  6. Step 6: Final answer
    x = 12,513.13

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.