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Finding the Fourth Proportional to 1,615.75, 2,229.78 and 917.17

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Solution

The fourth proportional to 1,615.75, 2,229.78 and 917.17 is: 1,265.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.75 : 2,229.78 = 917.17 : x
  2. Step 2: Convert to fraction form
    1,615.75/2,229.78 = 917.17/x
  3. Step 3: Cross multiply
    1,615.75x = 2,229.78 × 917.17
  4. Step 4: Simplify right side
    1,615.75x = 2,045,087.32
  5. Step 5: Solve for x
    x = 2,045,087.32/1,615.75
  6. Step 6: Final answer
    x = 1,265.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.