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Finding the Third Proportional to 615.19 and 913.78

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Solution

The third proportional to 615.19 and 913.78 is: 1,357.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.19 : 913.78 = 913.78 : x
  2. Step 2: Convert to fraction form
    615.19/913.78 = 913.78/x
  3. Step 3: Cross multiply
    615.19x = 913.78 × 913.78
  4. Step 4: Simplify right side
    615.19x = 834,996.17
  5. Step 5: Solve for x
    x = 834,996.17/615.19
  6. Step 6: Final answer
    x = 1,357.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.