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Finding the Fourth Proportional to 672.95, 928.78 and 393.35

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Solution

The fourth proportional to 672.95, 928.78 and 393.35 is: 542.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.95 : 928.78 = 393.35 : x
  2. Step 2: Convert to fraction form
    672.95/928.78 = 393.35/x
  3. Step 3: Cross multiply
    672.95x = 928.78 × 393.35
  4. Step 4: Simplify right side
    672.95x = 365,330.97
  5. Step 5: Solve for x
    x = 365,330.97/672.95
  6. Step 6: Final answer
    x = 542.88

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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.