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Finding the Fourth Proportional to 661.32, 991.71 and 336.51

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Solution

The fourth proportional to 661.32, 991.71 and 336.51 is: 504.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.32 : 991.71 = 336.51 : x
  2. Step 2: Convert to fraction form
    661.32/991.71 = 336.51/x
  3. Step 3: Cross multiply
    661.32x = 991.71 × 336.51
  4. Step 4: Simplify right side
    661.32x = 333,720.33
  5. Step 5: Solve for x
    x = 333,720.33/661.32
  6. Step 6: Final answer
    x = 504.63

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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.