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Finding the Fourth Proportional to 625.88, 864.30 and 393.41

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Solution

The fourth proportional to 625.88, 864.30 and 393.41 is: 543.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.88 : 864.30 = 393.41 : x
  2. Step 2: Convert to fraction form
    625.88/864.30 = 393.41/x
  3. Step 3: Cross multiply
    625.88x = 864.30 × 393.41
  4. Step 4: Simplify right side
    625.88x = 340,024.26
  5. Step 5: Solve for x
    x = 340,024.26/625.88
  6. Step 6: Final answer
    x = 543.27

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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.