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Finding the Fourth Proportional to 125.78, 174.76 and 124.64

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Solution

The fourth proportional to 125.78, 174.76 and 124.64 is: 173.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.78 : 174.76 = 124.64 : x
  2. Step 2: Convert to fraction form
    125.78/174.76 = 124.64/x
  3. Step 3: Cross multiply
    125.78x = 174.76 × 124.64
  4. Step 4: Simplify right side
    125.78x = 21,782.09
  5. Step 5: Solve for x
    x = 21,782.09/125.78
  6. Step 6: Final answer
    x = 173.18

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.