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Finding the Fourth Proportional to 1,308.50, 1,962.29 and 789.08

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Solution

The fourth proportional to 1,308.50, 1,962.29 and 789.08 is: 1,183.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.50 : 1,962.29 = 789.08 : x
  2. Step 2: Convert to fraction form
    1,308.50/1,962.29 = 789.08/x
  3. Step 3: Cross multiply
    1,308.50x = 1,962.29 × 789.08
  4. Step 4: Simplify right side
    1,308.50x = 1,548,390.04
  5. Step 5: Solve for x
    x = 1,548,390.04/1,308.50
  6. Step 6: Final answer
    x = 1,183.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.