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Finding the Fourth Proportional to 1,224.04, 1,689.16 and 664.51

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Solution

The fourth proportional to 1,224.04, 1,689.16 and 664.51 is: 917.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.04 : 1,689.16 = 664.51 : x
  2. Step 2: Convert to fraction form
    1,224.04/1,689.16 = 664.51/x
  3. Step 3: Cross multiply
    1,224.04x = 1,689.16 × 664.51
  4. Step 4: Simplify right side
    1,224.04x = 1,122,463.71
  5. Step 5: Solve for x
    x = 1,122,463.71/1,224.04
  6. Step 6: Final answer
    x = 917.02

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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.