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Finding the Third Proportional to 917.81 and 1,378.88

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Solution

The third proportional to 917.81 and 1,378.88 is: 2,071.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.81 : 1,378.88 = 1,378.88 : x
  2. Step 2: Convert to fraction form
    917.81/1,378.88 = 1,378.88/x
  3. Step 3: Cross multiply
    917.81x = 1,378.88 × 1,378.88
  4. Step 4: Simplify right side
    917.81x = 1,901,296.27
  5. Step 5: Solve for x
    x = 1,901,296.27/917.81
  6. Step 6: Final answer
    x = 2,071.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.