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Finding the Fourth Proportional to 2,812.91, 4,218.99 and 864.95

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Solution

The fourth proportional to 2,812.91, 4,218.99 and 864.95 is: 1,297.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.91 : 4,218.99 = 864.95 : x
  2. Step 2: Convert to fraction form
    2,812.91/4,218.99 = 864.95/x
  3. Step 3: Cross multiply
    2,812.91x = 4,218.99 × 864.95
  4. Step 4: Simplify right side
    2,812.91x = 3,649,215.40
  5. Step 5: Solve for x
    x = 3,649,215.40/2,812.91
  6. Step 6: Final answer
    x = 1,297.31

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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.