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Finding the Fourth Proportional to 2,760.66, 4,139.64 and 812.34

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Solution

The fourth proportional to 2,760.66, 4,139.64 and 812.34 is: 1,218.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,760.66 : 4,139.64 = 812.34 : x
  2. Step 2: Convert to fraction form
    2,760.66/4,139.64 = 812.34/x
  3. Step 3: Cross multiply
    2,760.66x = 4,139.64 × 812.34
  4. Step 4: Simplify right side
    2,760.66x = 3,362,795.16
  5. Step 5: Solve for x
    x = 3,362,795.16/2,760.66
  6. Step 6: Final answer
    x = 1,218.11

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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.