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Finding the Fourth Proportional to 1,208.32, 1,667.78 and 684.66

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Solution

The fourth proportional to 1,208.32, 1,667.78 and 684.66 is: 945.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.32 : 1,667.78 = 684.66 : x
  2. Step 2: Convert to fraction form
    1,208.32/1,667.78 = 684.66/x
  3. Step 3: Cross multiply
    1,208.32x = 1,667.78 × 684.66
  4. Step 4: Simplify right side
    1,208.32x = 1,141,862.25
  5. Step 5: Solve for x
    x = 1,141,862.25/1,208.32
  6. Step 6: Final answer
    x = 945.00

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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.