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Finding the Fourth Proportional to 661.14, 991.76 and 314.42

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Solution

The fourth proportional to 661.14, 991.76 and 314.42 is: 471.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.14 : 991.76 = 314.42 : x
  2. Step 2: Convert to fraction form
    661.14/991.76 = 314.42/x
  3. Step 3: Cross multiply
    661.14x = 991.76 × 314.42
  4. Step 4: Simplify right side
    661.14x = 311,822.65
  5. Step 5: Solve for x
    x = 311,822.65/661.14
  6. Step 6: Final answer
    x = 471.64

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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.