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Finding the Fourth Proportional to 672.34, 927.79 and 392.67

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Solution

The fourth proportional to 672.34, 927.79 and 392.67 is: 541.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.34 : 927.79 = 392.67 : x
  2. Step 2: Convert to fraction form
    672.34/927.79 = 392.67/x
  3. Step 3: Cross multiply
    672.34x = 927.79 × 392.67
  4. Step 4: Simplify right side
    672.34x = 364,308.70
  5. Step 5: Solve for x
    x = 364,308.70/672.34
  6. Step 6: Final answer
    x = 541.85

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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.