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Finding the Fourth Proportional to 1,615.78, 2,229.78 and 917.14

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Solution

The fourth proportional to 1,615.78, 2,229.78 and 917.14 is: 1,265.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.78 : 2,229.78 = 917.14 : x
  2. Step 2: Convert to fraction form
    1,615.78/2,229.78 = 917.14/x
  3. Step 3: Cross multiply
    1,615.78x = 2,229.78 × 917.14
  4. Step 4: Simplify right side
    1,615.78x = 2,045,020.43
  5. Step 5: Solve for x
    x = 2,045,020.43/1,615.78
  6. Step 6: Final answer
    x = 1,265.66

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1.5x scale

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.