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Finding the Fourth Proportional to 124.78, 172 and 98.51

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Solution

The fourth proportional to 124.78, 172 and 98.51 is: 135.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.78 : 172 = 98.51 : x
  2. Step 2: Convert to fraction form
    124.78/172 = 98.51/x
  3. Step 3: Cross multiply
    124.78x = 172 × 98.51
  4. Step 4: Simplify right side
    124.78x = 16,943.72
  5. Step 5: Solve for x
    x = 16,943.72/124.78
  6. Step 6: Final answer
    x = 135.79

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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.