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Finding the Third Proportional to 915.75 and 1,921.50

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Solution

The third proportional to 915.75 and 1,921.50 is: 4,031.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.75 : 1,921.50 = 1,921.50 : x
  2. Step 2: Convert to fraction form
    915.75/1,921.50 = 1,921.50/x
  3. Step 3: Cross multiply
    915.75x = 1,921.50 × 1,921.50
  4. Step 4: Simplify right side
    915.75x = 3,692,162.25
  5. Step 5: Solve for x
    x = 3,692,162.25/915.75
  6. Step 6: Final answer
    x = 4,031.85

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.