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Finding the Fourth Proportional to 672.40, 927.92 and 406.84

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Solution

The fourth proportional to 672.40, 927.92 and 406.84 is: 561.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.40 : 927.92 = 406.84 : x
  2. Step 2: Convert to fraction form
    672.40/927.92 = 406.84/x
  3. Step 3: Cross multiply
    672.40x = 927.92 × 406.84
  4. Step 4: Simplify right side
    672.40x = 377,515.41
  5. Step 5: Solve for x
    x = 377,515.41/672.40
  6. Step 6: Final answer
    x = 561.44

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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.