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Finding the Fourth Proportional to 660.44, 991.38 and 387.02

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Solution

The fourth proportional to 660.44, 991.38 and 387.02 is: 580.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.44 : 991.38 = 387.02 : x
  2. Step 2: Convert to fraction form
    660.44/991.38 = 387.02/x
  3. Step 3: Cross multiply
    660.44x = 991.38 × 387.02
  4. Step 4: Simplify right side
    660.44x = 383,683.89
  5. Step 5: Solve for x
    x = 383,683.89/660.44
  6. Step 6: Final answer
    x = 580.95

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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.