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Finding the Fourth Proportional to 124.50, 171.77 and 100.00

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Solution

The fourth proportional to 124.50, 171.77 and 100.00 is: 137.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.50 : 171.77 = 100.00 : x
  2. Step 2: Convert to fraction form
    124.50/171.77 = 100.00/x
  3. Step 3: Cross multiply
    124.50x = 171.77 × 100.00
  4. Step 4: Simplify right side
    124.50x = 17,177.28
  5. Step 5: Solve for x
    x = 17,177.28/124.50
  6. Step 6: Final answer
    x = 137.97

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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.