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Finding the Fourth Proportional to 1,243.86, 1,865.85 and 513.46

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Solution

The fourth proportional to 1,243.86, 1,865.85 and 513.46 is: 770.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.86 : 1,865.85 = 513.46 : x
  2. Step 2: Convert to fraction form
    1,243.86/1,865.85 = 513.46/x
  3. Step 3: Cross multiply
    1,243.86x = 1,865.85 × 513.46
  4. Step 4: Simplify right side
    1,243.86x = 958,039.34
  5. Step 5: Solve for x
    x = 958,039.34/1,243.86
  6. Step 6: Final answer
    x = 770.21

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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.