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Finding the Fourth Proportional to 479.28, 660.88 and 313.24

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Solution

The fourth proportional to 479.28, 660.88 and 313.24 is: 431.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.28 : 660.88 = 313.24 : x
  2. Step 2: Convert to fraction form
    479.28/660.88 = 313.24/x
  3. Step 3: Cross multiply
    479.28x = 660.88 × 313.24
  4. Step 4: Simplify right side
    479.28x = 207,014.05
  5. Step 5: Solve for x
    x = 207,014.05/479.28
  6. Step 6: Final answer
    x = 431.93

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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.