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Finding the Fourth Proportional to 718.21, 990.13 and 482.20

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Solution

The fourth proportional to 718.21, 990.13 and 482.20 is: 664.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.21 : 990.13 = 482.20 : x
  2. Step 2: Convert to fraction form
    718.21/990.13 = 482.20/x
  3. Step 3: Cross multiply
    718.21x = 990.13 × 482.20
  4. Step 4: Simplify right side
    718.21x = 477,440.69
  5. Step 5: Solve for x
    x = 477,440.69/718.21
  6. Step 6: Final answer
    x = 664.76

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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.