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Finding the Fourth Proportional to 672.91, 928.26 and 393.05

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Solution

The fourth proportional to 672.91, 928.26 and 393.05 is: 542.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.91 : 928.26 = 393.05 : x
  2. Step 2: Convert to fraction form
    672.91/928.26 = 393.05/x
  3. Step 3: Cross multiply
    672.91x = 928.26 × 393.05
  4. Step 4: Simplify right side
    672.91x = 364,854.91
  5. Step 5: Solve for x
    x = 364,854.91/672.91
  6. Step 6: Final answer
    x = 542.21

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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.