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Finding the Fourth Proportional to 688.92, 949.86 and 479.27

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Solution

The fourth proportional to 688.92, 949.86 and 479.27 is: 660.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.92 : 949.86 = 479.27 : x
  2. Step 2: Convert to fraction form
    688.92/949.86 = 479.27/x
  3. Step 3: Cross multiply
    688.92x = 949.86 × 479.27
  4. Step 4: Simplify right side
    688.92x = 455,239.40
  5. Step 5: Solve for x
    x = 455,239.40/688.92
  6. Step 6: Final answer
    x = 660.80

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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.