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Finding the Fourth Proportional to 620.70, 930.90 and 187.90

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Solution

The fourth proportional to 620.70, 930.90 and 187.90 is: 281.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.70 : 930.90 = 187.90 : x
  2. Step 2: Convert to fraction form
    620.70/930.90 = 187.90/x
  3. Step 3: Cross multiply
    620.70x = 930.90 × 187.90
  4. Step 4: Simplify right side
    620.70x = 174,916.11
  5. Step 5: Solve for x
    x = 174,916.11/620.70
  6. Step 6: Final answer
    x = 281.80

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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.