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Finding the Fourth Proportional to 661.50, 991.98 and 296.21

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Solution

The fourth proportional to 661.50, 991.98 and 296.21 is: 444.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.50 : 991.98 = 296.21 : x
  2. Step 2: Convert to fraction form
    661.50/991.98 = 296.21/x
  3. Step 3: Cross multiply
    661.50x = 991.98 × 296.21
  4. Step 4: Simplify right side
    661.50x = 293,836.88
  5. Step 5: Solve for x
    x = 293,836.88/661.50
  6. Step 6: Final answer
    x = 444.20

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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.