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Finding the Third Proportional to 553.39 and 790.70

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Solution

The third proportional to 553.39 and 790.70 is: 1,129.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.39 : 790.70 = 790.70 : x
  2. Step 2: Convert to fraction form
    553.39/790.70 = 790.70/x
  3. Step 3: Cross multiply
    553.39x = 790.70 × 790.70
  4. Step 4: Simplify right side
    553.39x = 625,205.25
  5. Step 5: Solve for x
    x = 625,205.25/553.39
  6. Step 6: Final answer
    x = 1,129.76

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.