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Finding the Fourth Proportional to 687.22, 948.36 and 392.47

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Solution

The fourth proportional to 687.22, 948.36 and 392.47 is: 541.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.22 : 948.36 = 392.47 : x
  2. Step 2: Convert to fraction form
    687.22/948.36 = 392.47/x
  3. Step 3: Cross multiply
    687.22x = 948.36 × 392.47
  4. Step 4: Simplify right side
    687.22x = 372,202.85
  5. Step 5: Solve for x
    x = 372,202.85/687.22
  6. Step 6: Final answer
    x = 541.61

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1.5x scale

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.