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Finding the Third Proportional to 538.50 and 780

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Solution

The third proportional to 538.50 and 780 is: 1,129.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.50 : 780 = 780 : x
  2. Step 2: Convert to fraction form
    538.50/780 = 780/x
  3. Step 3: Cross multiply
    538.50x = 780 × 780
  4. Step 4: Simplify right side
    538.50x = 608,400
  5. Step 5: Solve for x
    x = 608,400/538.50
  6. Step 6: Final answer
    x = 1,129.81

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These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.