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Finding the Fourth Proportional to 661.54, 991.76 and 314.68

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Solution

The fourth proportional to 661.54, 991.76 and 314.68 is: 471.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.54 : 991.76 = 314.68 : x
  2. Step 2: Convert to fraction form
    661.54/991.76 = 314.68/x
  3. Step 3: Cross multiply
    661.54x = 991.76 × 314.68
  4. Step 4: Simplify right side
    661.54x = 312,087.04
  5. Step 5: Solve for x
    x = 312,087.04/661.54
  6. Step 6: Final answer
    x = 471.76

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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.