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Finding the Fourth Proportional to 672.46, 927.68 and 485.64

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Solution

The fourth proportional to 672.46, 927.68 and 485.64 is: 669.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.46 : 927.68 = 485.64 : x
  2. Step 2: Convert to fraction form
    672.46/927.68 = 485.64/x
  3. Step 3: Cross multiply
    672.46x = 927.68 × 485.64
  4. Step 4: Simplify right side
    672.46x = 450,518.52
  5. Step 5: Solve for x
    x = 450,518.52/672.46
  6. Step 6: Final answer
    x = 669.96

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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.