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Finding the Fourth Proportional to 478.96, 660.94 and 282.46

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Solution

The fourth proportional to 478.96, 660.94 and 282.46 is: 389.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.96 : 660.94 = 282.46 : x
  2. Step 2: Convert to fraction form
    478.96/660.94 = 282.46/x
  3. Step 3: Cross multiply
    478.96x = 660.94 × 282.46
  4. Step 4: Simplify right side
    478.96x = 186,689.11
  5. Step 5: Solve for x
    x = 186,689.11/478.96
  6. Step 6: Final answer
    x = 389.78

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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.