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Finding the Fourth Proportional to 672.73, 928.21 and 392.81

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Solution

The fourth proportional to 672.73, 928.21 and 392.81 is: 541.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.73 : 928.21 = 392.81 : x
  2. Step 2: Convert to fraction form
    672.73/928.21 = 392.81/x
  3. Step 3: Cross multiply
    672.73x = 928.21 × 392.81
  4. Step 4: Simplify right side
    672.73x = 364,603.57
  5. Step 5: Solve for x
    x = 364,603.57/672.73
  6. Step 6: Final answer
    x = 541.98

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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.