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Finding the Fourth Proportional to 1,209.12, 1,667.99 and 789.28

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Solution

The fourth proportional to 1,209.12, 1,667.99 and 789.28 is: 1,088.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.12 : 1,667.99 = 789.28 : x
  2. Step 2: Convert to fraction form
    1,209.12/1,667.99 = 789.28/x
  3. Step 3: Cross multiply
    1,209.12x = 1,667.99 × 789.28
  4. Step 4: Simplify right side
    1,209.12x = 1,316,508.95
  5. Step 5: Solve for x
    x = 1,316,508.95/1,209.12
  6. Step 6: Final answer
    x = 1,088.82

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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.