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Finding the Fourth Proportional to 128.37, 192.15 and 117.17

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Solution

The fourth proportional to 128.37, 192.15 and 117.17 is: 175.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.37 : 192.15 = 117.17 : x
  2. Step 2: Convert to fraction form
    128.37/192.15 = 117.17/x
  3. Step 3: Cross multiply
    128.37x = 192.15 × 117.17
  4. Step 4: Simplify right side
    128.37x = 22,513.25
  5. Step 5: Solve for x
    x = 22,513.25/128.37
  6. Step 6: Final answer
    x = 175.38

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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.