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Finding the Fourth Proportional to 127.90, 176.50 and 75.45

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Solution

The fourth proportional to 127.90, 176.50 and 75.45 is: 104.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.90 : 176.50 = 75.45 : x
  2. Step 2: Convert to fraction form
    127.90/176.50 = 75.45/x
  3. Step 3: Cross multiply
    127.90x = 176.50 × 75.45
  4. Step 4: Simplify right side
    127.90x = 13,317.11
  5. Step 5: Solve for x
    x = 13,317.11/127.90
  6. Step 6: Final answer
    x = 104.12

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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.