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Finding the Fourth Proportional to 672.69, 928.41 and 393.01

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Solution

The fourth proportional to 672.69, 928.41 and 393.01 is: 542.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.69 : 928.41 = 393.01 : x
  2. Step 2: Convert to fraction form
    672.69/928.41 = 393.01/x
  3. Step 3: Cross multiply
    672.69x = 928.41 × 393.01
  4. Step 4: Simplify right side
    672.69x = 364,872.09
  5. Step 5: Solve for x
    x = 364,872.09/672.69
  6. Step 6: Final answer
    x = 542.41

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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.