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Finding the Fourth Proportional to 1,241.57, 1,865.99 and 811.46

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Solution

The fourth proportional to 1,241.57, 1,865.99 and 811.46 is: 1,219.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241.57 : 1,865.99 = 811.46 : x
  2. Step 2: Convert to fraction form
    1,241.57/1,865.99 = 811.46/x
  3. Step 3: Cross multiply
    1,241.57x = 1,865.99 × 811.46
  4. Step 4: Simplify right side
    1,241.57x = 1,514,162.86
  5. Step 5: Solve for x
    x = 1,514,162.86/1,241.57
  6. Step 6: Final answer
    x = 1,219.56

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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.