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Finding the Fourth Proportional to 124.56, 172.06 and 103.91

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Solution

The fourth proportional to 124.56, 172.06 and 103.91 is: 143.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.56 : 172.06 = 103.91 : x
  2. Step 2: Convert to fraction form
    124.56/172.06 = 103.91/x
  3. Step 3: Cross multiply
    124.56x = 172.06 × 103.91
  4. Step 4: Simplify right side
    124.56x = 17,877.63
  5. Step 5: Solve for x
    x = 17,877.63/124.56
  6. Step 6: Final answer
    x = 143.53

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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.