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Finding the Fourth Proportional to 660.28, 992.36 and 318.52

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Solution

The fourth proportional to 660.28, 992.36 and 318.52 is: 478.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.28 : 992.36 = 318.52 : x
  2. Step 2: Convert to fraction form
    660.28/992.36 = 318.52/x
  3. Step 3: Cross multiply
    660.28x = 992.36 × 318.52
  4. Step 4: Simplify right side
    660.28x = 316,086.51
  5. Step 5: Solve for x
    x = 316,086.51/660.28
  6. Step 6: Final answer
    x = 478.72

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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.