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Finding the Fourth Proportional to 620.68, 931.30 and 187.88

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Solution

The fourth proportional to 620.68, 931.30 and 187.88 is: 281.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.68 : 931.30 = 187.88 : x
  2. Step 2: Convert to fraction form
    620.68/931.30 = 187.88/x
  3. Step 3: Cross multiply
    620.68x = 931.30 × 187.88
  4. Step 4: Simplify right side
    620.68x = 174,972.64
  5. Step 5: Solve for x
    x = 174,972.64/620.68
  6. Step 6: Final answer
    x = 281.90

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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.