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Finding the Fourth Proportional to 478.74, 660.73 and 313.44

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Solution

The fourth proportional to 478.74, 660.73 and 313.44 is: 432.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.74 : 660.73 = 313.44 : x
  2. Step 2: Convert to fraction form
    478.74/660.73 = 313.44/x
  3. Step 3: Cross multiply
    478.74x = 660.73 × 313.44
  4. Step 4: Simplify right side
    478.74x = 207,099.21
  5. Step 5: Solve for x
    x = 207,099.21/478.74
  6. Step 6: Final answer
    x = 432.59

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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.