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Finding the Fourth Proportional to 2,619.24, 3,929.43 and 864.79

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Solution

The fourth proportional to 2,619.24, 3,929.43 and 864.79 is: 1,297.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.24 : 3,929.43 = 864.79 : x
  2. Step 2: Convert to fraction form
    2,619.24/3,929.43 = 864.79/x
  3. Step 3: Cross multiply
    2,619.24x = 3,929.43 × 864.79
  4. Step 4: Simplify right side
    2,619.24x = 3,398,125.19
  5. Step 5: Solve for x
    x = 3,398,125.19/2,619.24
  6. Step 6: Final answer
    x = 1,297.37

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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.