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Finding the Fourth Proportional to 660.28, 992.34 and 318.52

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Solution

The fourth proportional to 660.28, 992.34 and 318.52 is: 478.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.28 : 992.34 = 318.52 : x
  2. Step 2: Convert to fraction form
    660.28/992.34 = 318.52/x
  3. Step 3: Cross multiply
    660.28x = 992.34 × 318.52
  4. Step 4: Simplify right side
    660.28x = 316,080.14
  5. Step 5: Solve for x
    x = 316,080.14/660.28
  6. Step 6: Final answer
    x = 478.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.