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Finding the Fourth Proportional to 620.78, 931.26 and 187.97

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Solution

The fourth proportional to 620.78, 931.26 and 187.97 is: 281.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.78 : 931.26 = 187.97 : x
  2. Step 2: Convert to fraction form
    620.78/931.26 = 187.97/x
  3. Step 3: Cross multiply
    620.78x = 931.26 × 187.97
  4. Step 4: Simplify right side
    620.78x = 175,048.94
  5. Step 5: Solve for x
    x = 175,048.94/620.78
  6. Step 6: Final answer
    x = 281.98

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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.