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Finding the Fourth Proportional to 128.16, 192.24 and 101.13

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Solution

The fourth proportional to 128.16, 192.24 and 101.13 is: 151.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.16 : 192.24 = 101.13 : x
  2. Step 2: Convert to fraction form
    128.16/192.24 = 101.13/x
  3. Step 3: Cross multiply
    128.16x = 192.24 × 101.13
  4. Step 4: Simplify right side
    128.16x = 19,441.23
  5. Step 5: Solve for x
    x = 19,441.23/128.16
  6. Step 6: Final answer
    x = 151.70

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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.