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Finding the Fourth Proportional to 128.15, 192.26 and 47

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Solution

The fourth proportional to 128.15, 192.26 and 47 is: 70.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.15 : 192.26 = 47 : x
  2. Step 2: Convert to fraction form
    128.15/192.26 = 47/x
  3. Step 3: Cross multiply
    128.15x = 192.26 × 47
  4. Step 4: Simplify right side
    128.15x = 9,036.22
  5. Step 5: Solve for x
    x = 9,036.22/128.15
  6. Step 6: Final answer
    x = 70.51

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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.