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Finding the Third Proportional to 790.50 and 1,221.56

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Solution

The third proportional to 790.50 and 1,221.56 is: 1,887.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.50 : 1,221.56 = 1,221.56 : x
  2. Step 2: Convert to fraction form
    790.50/1,221.56 = 1,221.56/x
  3. Step 3: Cross multiply
    790.50x = 1,221.56 × 1,221.56
  4. Step 4: Simplify right side
    790.50x = 1,492,214.94
  5. Step 5: Solve for x
    x = 1,492,214.94/790.50
  6. Step 6: Final answer
    x = 1,887.68

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.