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Finding the Fourth Proportional to 1,209.51, 1,669.01 and 685.17

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Solution

The fourth proportional to 1,209.51, 1,669.01 and 685.17 is: 945.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.51 : 1,669.01 = 685.17 : x
  2. Step 2: Convert to fraction form
    1,209.51/1,669.01 = 685.17/x
  3. Step 3: Cross multiply
    1,209.51x = 1,669.01 × 685.17
  4. Step 4: Simplify right side
    1,209.51x = 1,143,552.16
  5. Step 5: Solve for x
    x = 1,143,552.16/1,209.51
  6. Step 6: Final answer
    x = 945.47

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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.