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Finding the Fourth Proportional to 127.34, 175.78 and 78.20

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Solution

The fourth proportional to 127.34, 175.78 and 78.20 is: 107.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.34 : 175.78 = 78.20 : x
  2. Step 2: Convert to fraction form
    127.34/175.78 = 78.20/x
  3. Step 3: Cross multiply
    127.34x = 175.78 × 78.20
  4. Step 4: Simplify right side
    127.34x = 13,746.00
  5. Step 5: Solve for x
    x = 13,746.00/127.34
  6. Step 6: Final answer
    x = 107.95

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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.