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Finding the Fourth Proportional to 1,211.79, 1,816.33 and 518.11

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Solution

The fourth proportional to 1,211.79, 1,816.33 and 518.11 is: 776.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.79 : 1,816.33 = 518.11 : x
  2. Step 2: Convert to fraction form
    1,211.79/1,816.33 = 518.11/x
  3. Step 3: Cross multiply
    1,211.79x = 1,816.33 × 518.11
  4. Step 4: Simplify right side
    1,211.79x = 941,058.74
  5. Step 5: Solve for x
    x = 941,058.74/1,211.79
  6. Step 6: Final answer
    x = 776.59

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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.