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Finding the Fourth Proportional to 164.20, 246.30 and 139.72

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Solution

The fourth proportional to 164.20, 246.30 and 139.72 is: 209.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.20 : 246.30 = 139.72 : x
  2. Step 2: Convert to fraction form
    164.20/246.30 = 139.72/x
  3. Step 3: Cross multiply
    164.20x = 246.30 × 139.72
  4. Step 4: Simplify right side
    164.20x = 34,413.04
  5. Step 5: Solve for x
    x = 34,413.04/164.20
  6. Step 6: Final answer
    x = 209.58

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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.