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Finding the Fourth Proportional to 621.26, 931.86 and 188.42

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Solution

The fourth proportional to 621.26, 931.86 and 188.42 is: 282.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.26 : 931.86 = 188.42 : x
  2. Step 2: Convert to fraction form
    621.26/931.86 = 188.42/x
  3. Step 3: Cross multiply
    621.26x = 931.86 × 188.42
  4. Step 4: Simplify right side
    621.26x = 175,576.40
  5. Step 5: Solve for x
    x = 175,576.40/621.26
  6. Step 6: Final answer
    x = 282.62

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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.