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Finding the Third Proportional to 688.88 and 931.13

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Solution

The third proportional to 688.88 and 931.13 is: 1,258.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.88 : 931.13 = 931.13 : x
  2. Step 2: Convert to fraction form
    688.88/931.13 = 931.13/x
  3. Step 3: Cross multiply
    688.88x = 931.13 × 931.13
  4. Step 4: Simplify right side
    688.88x = 866,993.77
  5. Step 5: Solve for x
    x = 866,993.77/688.88
  6. Step 6: Final answer
    x = 1,258.56

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.