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Finding the Fourth Proportional to 2,812.32, 4,218.40 and 864.48

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Solution

The fourth proportional to 2,812.32, 4,218.40 and 864.48 is: 1,296.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.32 : 4,218.40 = 864.48 : x
  2. Step 2: Convert to fraction form
    2,812.32/4,218.40 = 864.48/x
  3. Step 3: Cross multiply
    2,812.32x = 4,218.40 × 864.48
  4. Step 4: Simplify right side
    2,812.32x = 3,646,722.43
  5. Step 5: Solve for x
    x = 3,646,722.43/2,812.32
  6. Step 6: Final answer
    x = 1,296.70

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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.