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Finding the Fourth Proportional to 164.76, 247.21 and 128.99

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Solution

The fourth proportional to 164.76, 247.21 and 128.99 is: 193.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.76 : 247.21 = 128.99 : x
  2. Step 2: Convert to fraction form
    164.76/247.21 = 128.99/x
  3. Step 3: Cross multiply
    164.76x = 247.21 × 128.99
  4. Step 4: Simplify right side
    164.76x = 31,886.38
  5. Step 5: Solve for x
    x = 31,886.38/164.76
  6. Step 6: Final answer
    x = 193.53

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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.