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Finding the Fourth Proportional to 2,812.70, 4,218.56 and 864.38

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Solution

The fourth proportional to 2,812.70, 4,218.56 and 864.38 is: 1,296.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.70 : 4,218.56 = 864.38 : x
  2. Step 2: Convert to fraction form
    2,812.70/4,218.56 = 864.38/x
  3. Step 3: Cross multiply
    2,812.70x = 4,218.56 × 864.38
  4. Step 4: Simplify right side
    2,812.70x = 3,646,438.89
  5. Step 5: Solve for x
    x = 3,646,438.89/2,812.70
  6. Step 6: Final answer
    x = 1,296.42

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1.5x scale

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.