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Finding the Fourth Proportional to 127.79, 191.69 and 31.60

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Solution

The fourth proportional to 127.79, 191.69 and 31.60 is: 47.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.79 : 191.69 = 31.60 : x
  2. Step 2: Convert to fraction form
    127.79/191.69 = 31.60/x
  3. Step 3: Cross multiply
    127.79x = 191.69 × 31.60
  4. Step 4: Simplify right side
    127.79x = 6,057.25
  5. Step 5: Solve for x
    x = 6,057.25/127.79
  6. Step 6: Final answer
    x = 47.40

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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.