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Finding the Fourth Proportional to 131.66, 197.54 and 77.58

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Solution

The fourth proportional to 131.66, 197.54 and 77.58 is: 116.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.66 : 197.54 = 77.58 : x
  2. Step 2: Convert to fraction form
    131.66/197.54 = 77.58/x
  3. Step 3: Cross multiply
    131.66x = 197.54 × 77.58
  4. Step 4: Simplify right side
    131.66x = 15,324.77
  5. Step 5: Solve for x
    x = 15,324.77/131.66
  6. Step 6: Final answer
    x = 116.40

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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.