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Finding the Fourth Proportional to 127.40, 175.48 and 107.70

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Solution

The fourth proportional to 127.40, 175.48 and 107.70 is: 148.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.40 : 175.48 = 107.70 : x
  2. Step 2: Convert to fraction form
    127.40/175.48 = 107.70/x
  3. Step 3: Cross multiply
    127.40x = 175.48 × 107.70
  4. Step 4: Simplify right side
    127.40x = 18,899.20
  5. Step 5: Solve for x
    x = 18,899.20/127.40
  6. Step 6: Final answer
    x = 148.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.