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Finding the Fourth Proportional to 2,390.71, 3,299.13 and 1,328.48

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Solution

The fourth proportional to 2,390.71, 3,299.13 and 1,328.48 is: 1,833.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,390.71 : 3,299.13 = 1,328.48 : x
  2. Step 2: Convert to fraction form
    2,390.71/3,299.13 = 1,328.48/x
  3. Step 3: Cross multiply
    2,390.71x = 3,299.13 × 1,328.48
  4. Step 4: Simplify right side
    2,390.71x = 4,382,828.22
  5. Step 5: Solve for x
    x = 4,382,828.22/2,390.71
  6. Step 6: Final answer
    x = 1,833.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.