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Finding the Fourth Proportional to 687.36, 948.45 and 392.52

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Solution

The fourth proportional to 687.36, 948.45 and 392.52 is: 541.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.36 : 948.45 = 392.52 : x
  2. Step 2: Convert to fraction form
    687.36/948.45 = 392.52/x
  3. Step 3: Cross multiply
    687.36x = 948.45 × 392.52
  4. Step 4: Simplify right side
    687.36x = 372,280.85
  5. Step 5: Solve for x
    x = 372,280.85/687.36
  6. Step 6: Final answer
    x = 541.61

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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.