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Finding the Fourth Proportional to 661.01, 991.50 and 388.82

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Solution

The fourth proportional to 661.01, 991.50 and 388.82 is: 583.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.01 : 991.50 = 388.82 : x
  2. Step 2: Convert to fraction form
    661.01/991.50 = 388.82/x
  3. Step 3: Cross multiply
    661.01x = 991.50 × 388.82
  4. Step 4: Simplify right side
    661.01x = 385,516.05
  5. Step 5: Solve for x
    x = 385,516.05/661.01
  6. Step 6: Final answer
    x = 583.23

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Similar ratio
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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.