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Finding the Third Proportional to 688.13 and 788.81

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Solution

The third proportional to 688.13 and 788.81 is: 904.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.13 : 788.81 = 788.81 : x
  2. Step 2: Convert to fraction form
    688.13/788.81 = 788.81/x
  3. Step 3: Cross multiply
    688.13x = 788.81 × 788.81
  4. Step 4: Simplify right side
    688.13x = 622,225.16
  5. Step 5: Solve for x
    x = 622,225.16/688.13
  6. Step 6: Final answer
    x = 904.23

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.