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Finding the Fourth Proportional to 478.58, 660.44 and 282.20

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Solution

The fourth proportional to 478.58, 660.44 and 282.20 is: 389.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.58 : 660.44 = 282.20 : x
  2. Step 2: Convert to fraction form
    478.58/660.44 = 282.20/x
  3. Step 3: Cross multiply
    478.58x = 660.44 × 282.20
  4. Step 4: Simplify right side
    478.58x = 186,376.17
  5. Step 5: Solve for x
    x = 186,376.17/478.58
  6. Step 6: Final answer
    x = 389.44

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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.