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Finding the Fourth Proportional to 661.33, 992.45 and 656.21

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Solution

The fourth proportional to 661.33, 992.45 and 656.21 is: 984.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.33 : 992.45 = 656.21 : x
  2. Step 2: Convert to fraction form
    661.33/992.45 = 656.21/x
  3. Step 3: Cross multiply
    661.33x = 992.45 × 656.21
  4. Step 4: Simplify right side
    661.33x = 651,252.29
  5. Step 5: Solve for x
    x = 651,252.29/661.33
  6. Step 6: Final answer
    x = 984.76

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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.