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Finding the Fourth Proportional to 626.43, 864.43 and 390.41

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Solution

The fourth proportional to 626.43, 864.43 and 390.41 is: 538.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.43 : 864.43 = 390.41 : x
  2. Step 2: Convert to fraction form
    626.43/864.43 = 390.41/x
  3. Step 3: Cross multiply
    626.43x = 864.43 × 390.41
  4. Step 4: Simplify right side
    626.43x = 337,487.06
  5. Step 5: Solve for x
    x = 337,487.06/626.43
  6. Step 6: Final answer
    x = 538.75

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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.