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Finding the Fourth Proportional to 1,224.26, 1,689.51 and 693.18

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Solution

The fourth proportional to 1,224.26, 1,689.51 and 693.18 is: 956.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.26 : 1,689.51 = 693.18 : x
  2. Step 2: Convert to fraction form
    1,224.26/1,689.51 = 693.18/x
  3. Step 3: Cross multiply
    1,224.26x = 1,689.51 × 693.18
  4. Step 4: Simplify right side
    1,224.26x = 1,171,134.54
  5. Step 5: Solve for x
    x = 1,171,134.54/1,224.26
  6. Step 6: Final answer
    x = 956.61

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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.