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Finding the Fourth Proportional to 660.56, 991.44 and 314.08

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Solution

The fourth proportional to 660.56, 991.44 and 314.08 is: 471.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.56 : 991.44 = 314.08 : x
  2. Step 2: Convert to fraction form
    660.56/991.44 = 314.08/x
  3. Step 3: Cross multiply
    660.56x = 991.44 × 314.08
  4. Step 4: Simplify right side
    660.56x = 311,391.48
  5. Step 5: Solve for x
    x = 311,391.48/660.56
  6. Step 6: Final answer
    x = 471.41

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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.