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Finding the Fourth Proportional to 620.50, 930.78 and 164.50

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Solution

The fourth proportional to 620.50, 930.78 and 164.50 is: 246.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.50 : 930.78 = 164.50 : x
  2. Step 2: Convert to fraction form
    620.50/930.78 = 164.50/x
  3. Step 3: Cross multiply
    620.50x = 930.78 × 164.50
  4. Step 4: Simplify right side
    620.50x = 153,113.31
  5. Step 5: Solve for x
    x = 153,113.31/620.50
  6. Step 6: Final answer
    x = 246.76

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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.