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Finding the Fourth Proportional to 672.81, 928.53 and 378.11

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Solution

The fourth proportional to 672.81, 928.53 and 378.11 is: 521.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.81 : 928.53 = 378.11 : x
  2. Step 2: Convert to fraction form
    672.81/928.53 = 378.11/x
  3. Step 3: Cross multiply
    672.81x = 928.53 × 378.11
  4. Step 4: Simplify right side
    672.81x = 351,081.84
  5. Step 5: Solve for x
    x = 351,081.84/672.81
  6. Step 6: Final answer
    x = 521.81

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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.