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Finding the Fourth Proportional to 131.66, 197.19 and 70.64

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Solution

The fourth proportional to 131.66, 197.19 and 70.64 is: 105.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.66 : 197.19 = 70.64 : x
  2. Step 2: Convert to fraction form
    131.66/197.19 = 70.64/x
  3. Step 3: Cross multiply
    131.66x = 197.19 × 70.64
  4. Step 4: Simplify right side
    131.66x = 13,929.50
  5. Step 5: Solve for x
    x = 13,929.50/131.66
  6. Step 6: Final answer
    x = 105.80

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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.