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Finding the Fourth Proportional to 164.79, 246.15 and 128.61

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Solution

The fourth proportional to 164.79, 246.15 and 128.61 is: 192.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.79 : 246.15 = 128.61 : x
  2. Step 2: Convert to fraction form
    164.79/246.15 = 128.61/x
  3. Step 3: Cross multiply
    164.79x = 246.15 × 128.61
  4. Step 4: Simplify right side
    164.79x = 31,657.35
  5. Step 5: Solve for x
    x = 31,657.35/164.79
  6. Step 6: Final answer
    x = 192.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.