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Finding the Fourth Proportional to 672.93, 928.48 and 393

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Solution

The fourth proportional to 672.93, 928.48 and 393 is: 542.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.93 : 928.48 = 393 : x
  2. Step 2: Convert to fraction form
    672.93/928.48 = 393/x
  3. Step 3: Cross multiply
    672.93x = 928.48 × 393
  4. Step 4: Simplify right side
    672.93x = 364,892.64
  5. Step 5: Solve for x
    x = 364,892.64/672.93
  6. Step 6: Final answer
    x = 542.24

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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.