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Finding the Fourth Proportional to 478.82, 660.48 and 313.04

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Solution

The fourth proportional to 478.82, 660.48 and 313.04 is: 431.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.82 : 660.48 = 313.04 : x
  2. Step 2: Convert to fraction form
    478.82/660.48 = 313.04/x
  3. Step 3: Cross multiply
    478.82x = 660.48 × 313.04
  4. Step 4: Simplify right side
    478.82x = 206,756.66
  5. Step 5: Solve for x
    x = 206,756.66/478.82
  6. Step 6: Final answer
    x = 431.80

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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.