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Finding the Fourth Proportional to 1,224.11, 1,689.28 and 664.58

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Solution

The fourth proportional to 1,224.11, 1,689.28 and 664.58 is: 917.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.11 : 1,689.28 = 664.58 : x
  2. Step 2: Convert to fraction form
    1,224.11/1,689.28 = 664.58/x
  3. Step 3: Cross multiply
    1,224.11x = 1,689.28 × 664.58
  4. Step 4: Simplify right side
    1,224.11x = 1,122,664.26
  5. Step 5: Solve for x
    x = 1,122,664.26/1,224.11
  6. Step 6: Final answer
    x = 917.13

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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.