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Finding the Fourth Proportional to 127.32, 190.90 and 49.20

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Solution

The fourth proportional to 127.32, 190.90 and 49.20 is: 73.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.32 : 190.90 = 49.20 : x
  2. Step 2: Convert to fraction form
    127.32/190.90 = 49.20/x
  3. Step 3: Cross multiply
    127.32x = 190.90 × 49.20
  4. Step 4: Simplify right side
    127.32x = 9,392.28
  5. Step 5: Solve for x
    x = 9,392.28/127.32
  6. Step 6: Final answer
    x = 73.77

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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.