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Finding the Fourth Proportional to 479.33, 660.72 and 400.91

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Solution

The fourth proportional to 479.33, 660.72 and 400.91 is: 552.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.33 : 660.72 = 400.91 : x
  2. Step 2: Convert to fraction form
    479.33/660.72 = 400.91/x
  3. Step 3: Cross multiply
    479.33x = 660.72 × 400.91
  4. Step 4: Simplify right side
    479.33x = 264,885.95
  5. Step 5: Solve for x
    x = 264,885.95/479.33
  6. Step 6: Final answer
    x = 552.62

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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.