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Finding the Fourth Proportional to 672.45, 928.37 and 439.98

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Solution

The fourth proportional to 672.45, 928.37 and 439.98 is: 607.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.45 : 928.37 = 439.98 : x
  2. Step 2: Convert to fraction form
    672.45/928.37 = 439.98/x
  3. Step 3: Cross multiply
    672.45x = 928.37 × 439.98
  4. Step 4: Simplify right side
    672.45x = 408,464.23
  5. Step 5: Solve for x
    x = 408,464.23/672.45
  6. Step 6: Final answer
    x = 607.43

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1.5x scale

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.