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Finding the Fourth Proportional to 672.90, 928.46 and 378.08

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Solution

The fourth proportional to 672.90, 928.46 and 378.08 is: 521.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.90 : 928.46 = 378.08 : x
  2. Step 2: Convert to fraction form
    672.90/928.46 = 378.08/x
  3. Step 3: Cross multiply
    672.90x = 928.46 × 378.08
  4. Step 4: Simplify right side
    672.90x = 351,032.16
  5. Step 5: Solve for x
    x = 351,032.16/672.90
  6. Step 6: Final answer
    x = 521.67

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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.