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Finding the Fourth Proportional to 620.80, 931.26 and 187.96

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Solution

The fourth proportional to 620.80, 931.26 and 187.96 is: 281.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.80 : 931.26 = 187.96 : x
  2. Step 2: Convert to fraction form
    620.80/931.26 = 187.96/x
  3. Step 3: Cross multiply
    620.80x = 931.26 × 187.96
  4. Step 4: Simplify right side
    620.80x = 175,039.63
  5. Step 5: Solve for x
    x = 175,039.63/620.80
  6. Step 6: Final answer
    x = 281.96

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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.