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Finding the Fourth Proportional to 661.24, 991.68 and 445.96

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Solution

The fourth proportional to 661.24, 991.68 and 445.96 is: 668.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.24 : 991.68 = 445.96 : x
  2. Step 2: Convert to fraction form
    661.24/991.68 = 445.96/x
  3. Step 3: Cross multiply
    661.24x = 991.68 × 445.96
  4. Step 4: Simplify right side
    661.24x = 442,249.61
  5. Step 5: Solve for x
    x = 442,249.61/661.24
  6. Step 6: Final answer
    x = 668.82

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1.5x scale

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.