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Finding the Fourth Proportional to 142.93, 197.54 and 128.08

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Solution

The fourth proportional to 142.93, 197.54 and 128.08 is: 177.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.93 : 197.54 = 128.08 : x
  2. Step 2: Convert to fraction form
    142.93/197.54 = 128.08/x
  3. Step 3: Cross multiply
    142.93x = 197.54 × 128.08
  4. Step 4: Simplify right side
    142.93x = 25,300.92
  5. Step 5: Solve for x
    x = 25,300.92/142.93
  6. Step 6: Final answer
    x = 177.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.