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Finding the Fourth Proportional to 124.83, 172.26 and 89.91

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Solution

The fourth proportional to 124.83, 172.26 and 89.91 is: 124.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.83 : 172.26 = 89.91 : x
  2. Step 2: Convert to fraction form
    124.83/172.26 = 89.91/x
  3. Step 3: Cross multiply
    124.83x = 172.26 × 89.91
  4. Step 4: Simplify right side
    124.83x = 15,487.90
  5. Step 5: Solve for x
    x = 15,487.90/124.83
  6. Step 6: Final answer
    x = 124.07

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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.