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Finding the Fourth Proportional to 1,274.22, 1,912.06 and 689.23

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Solution

The fourth proportional to 1,274.22, 1,912.06 and 689.23 is: 1,034.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.22 : 1,912.06 = 689.23 : x
  2. Step 2: Convert to fraction form
    1,274.22/1,912.06 = 689.23/x
  3. Step 3: Cross multiply
    1,274.22x = 1,912.06 × 689.23
  4. Step 4: Simplify right side
    1,274.22x = 1,317,849.11
  5. Step 5: Solve for x
    x = 1,317,849.11/1,274.22
  6. Step 6: Final answer
    x = 1,034.24

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1.5x scale

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.