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Finding the Fourth Proportional to 687.10, 948.26 and 392.41

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Solution

The fourth proportional to 687.10, 948.26 and 392.41 is: 541.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.10 : 948.26 = 392.41 : x
  2. Step 2: Convert to fraction form
    687.10/948.26 = 392.41/x
  3. Step 3: Cross multiply
    687.10x = 948.26 × 392.41
  4. Step 4: Simplify right side
    687.10x = 372,105.84
  5. Step 5: Solve for x
    x = 372,105.84/687.10
  6. Step 6: Final answer
    x = 541.56

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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.