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Finding the Fourth Proportional to 131.69, 197.64 and 70.89

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Solution

The fourth proportional to 131.69, 197.64 and 70.89 is: 106.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.69 : 197.64 = 70.89 : x
  2. Step 2: Convert to fraction form
    131.69/197.64 = 70.89/x
  3. Step 3: Cross multiply
    131.69x = 197.64 × 70.89
  4. Step 4: Simplify right side
    131.69x = 14,010.70
  5. Step 5: Solve for x
    x = 14,010.70/131.69
  6. Step 6: Final answer
    x = 106.40

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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.