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Finding the Fourth Proportional to 124.99, 172.48 and 69.72

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Solution

The fourth proportional to 124.99, 172.48 and 69.72 is: 96.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.99 : 172.48 = 69.72 : x
  2. Step 2: Convert to fraction form
    124.99/172.48 = 69.72/x
  3. Step 3: Cross multiply
    124.99x = 172.48 × 69.72
  4. Step 4: Simplify right side
    124.99x = 12,025.31
  5. Step 5: Solve for x
    x = 12,025.31/124.99
  6. Step 6: Final answer
    x = 96.21

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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.