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Finding the Fourth Proportional to 142.89, 197.40 and 99.37

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Solution

The fourth proportional to 142.89, 197.40 and 99.37 is: 137.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.89 : 197.40 = 99.37 : x
  2. Step 2: Convert to fraction form
    142.89/197.40 = 99.37/x
  3. Step 3: Cross multiply
    142.89x = 197.40 × 99.37
  4. Step 4: Simplify right side
    142.89x = 19,615.64
  5. Step 5: Solve for x
    x = 19,615.64/142.89
  6. Step 6: Final answer
    x = 137.28

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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.