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Finding the Fourth Proportional to 130.72, 197.56 and 128.48

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Solution

The fourth proportional to 130.72, 197.56 and 128.48 is: 194.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.72 : 197.56 = 128.48 : x
  2. Step 2: Convert to fraction form
    130.72/197.56 = 128.48/x
  3. Step 3: Cross multiply
    130.72x = 197.56 × 128.48
  4. Step 4: Simplify right side
    130.72x = 25,382.51
  5. Step 5: Solve for x
    x = 25,382.51/130.72
  6. Step 6: Final answer
    x = 194.17

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.