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Finding the Fourth Proportional to 72.93, 109.42 and 21.57

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Solution

The fourth proportional to 72.93, 109.42 and 21.57 is: 32.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.93 : 109.42 = 21.57 : x
  2. Step 2: Convert to fraction form
    72.93/109.42 = 21.57/x
  3. Step 3: Cross multiply
    72.93x = 109.42 × 21.57
  4. Step 4: Simplify right side
    72.93x = 2,360.08
  5. Step 5: Solve for x
    x = 2,360.08/72.93
  6. Step 6: Final answer
    x = 32.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.