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Finding the Fourth Proportional to 1,418.91, 2,128.36 and 392.91

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Solution

The fourth proportional to 1,418.91, 2,128.36 and 392.91 is: 589.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.91 : 2,128.36 = 392.91 : x
  2. Step 2: Convert to fraction form
    1,418.91/2,128.36 = 392.91/x
  3. Step 3: Cross multiply
    1,418.91x = 2,128.36 × 392.91
  4. Step 4: Simplify right side
    1,418.91x = 836,245.70
  5. Step 5: Solve for x
    x = 836,245.70/1,418.91
  6. Step 6: Final answer
    x = 589.36

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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.