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Finding the Fourth Proportional to 131.16, 196.50 and 87.70

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Solution

The fourth proportional to 131.16, 196.50 and 87.70 is: 131.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.16 : 196.50 = 87.70 : x
  2. Step 2: Convert to fraction form
    131.16/196.50 = 87.70/x
  3. Step 3: Cross multiply
    131.16x = 196.50 × 87.70
  4. Step 4: Simplify right side
    131.16x = 17,233.83
  5. Step 5: Solve for x
    x = 17,233.83/131.16
  6. Step 6: Final answer
    x = 131.39

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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.