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Finding the Fourth Proportional to 1,241.72, 1,860.42 and 780.56

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Solution

The fourth proportional to 1,241.72, 1,860.42 and 780.56 is: 1,169.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241.72 : 1,860.42 = 780.56 : x
  2. Step 2: Convert to fraction form
    1,241.72/1,860.42 = 780.56/x
  3. Step 3: Cross multiply
    1,241.72x = 1,860.42 × 780.56
  4. Step 4: Simplify right side
    1,241.72x = 1,452,169.44
  5. Step 5: Solve for x
    x = 1,452,169.44/1,241.72
  6. Step 6: Final answer
    x = 1,169.48

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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.