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Finding the Fourth Proportional to 124.40, 171.64 and 72.64

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Solution

The fourth proportional to 124.40, 171.64 and 72.64 is: 100.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.40 : 171.64 = 72.64 : x
  2. Step 2: Convert to fraction form
    124.40/171.64 = 72.64/x
  3. Step 3: Cross multiply
    124.40x = 171.64 × 72.64
  4. Step 4: Simplify right side
    124.40x = 12,467.93
  5. Step 5: Solve for x
    x = 12,467.93/124.40
  6. Step 6: Final answer
    x = 100.22

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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.