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Finding the Fourth Proportional to 131.78, 197.63 and 88.74

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Solution

The fourth proportional to 131.78, 197.63 and 88.74 is: 133.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.78 : 197.63 = 88.74 : x
  2. Step 2: Convert to fraction form
    131.78/197.63 = 88.74/x
  3. Step 3: Cross multiply
    131.78x = 197.63 × 88.74
  4. Step 4: Simplify right side
    131.78x = 17,537.24
  5. Step 5: Solve for x
    x = 17,537.24/131.78
  6. Step 6: Final answer
    x = 133.08

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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.