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Finding the Fourth Proportional to 661, 991.18 and 314.12

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Solution

The fourth proportional to 661, 991.18 and 314.12 is: 471.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    661 : 991.18 = 314.12 : x
  2. Step 2: Convert to fraction form
    661/991.18 = 314.12/x
  3. Step 3: Cross multiply
    661x = 991.18 × 314.12
  4. Step 4: Simplify right side
    661x = 311,349.46
  5. Step 5: Solve for x
    x = 311,349.46/661
  6. Step 6: Final answer
    x = 471.03

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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.