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Finding the Third Proportional to 617 and 915

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Solution

The third proportional to 617 and 915 is: 1,356.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    617 : 915 = 915 : x
  2. Step 2: Convert to fraction form
    617/915 = 915/x
  3. Step 3: Cross multiply
    617x = 915 × 915
  4. Step 4: Simplify right side
    617x = 837,225
  5. Step 5: Solve for x
    x = 837,225/617
  6. Step 6: Final answer
    x = 1,356.93

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.