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Finding the Fourth Proportional to 127.90, 191.85 and 70.11

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Solution

The fourth proportional to 127.90, 191.85 and 70.11 is: 105.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.90 : 191.85 = 70.11 : x
  2. Step 2: Convert to fraction form
    127.90/191.85 = 70.11/x
  3. Step 3: Cross multiply
    127.90x = 191.85 × 70.11
  4. Step 4: Simplify right side
    127.90x = 13,450.60
  5. Step 5: Solve for x
    x = 13,450.60/127.90
  6. Step 6: Final answer
    x = 105.17

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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.