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Finding the Fourth Proportional to 72.10, 108.21 and 43.24

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Solution

The fourth proportional to 72.10, 108.21 and 43.24 is: 64.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.10 : 108.21 = 43.24 : x
  2. Step 2: Convert to fraction form
    72.10/108.21 = 43.24/x
  3. Step 3: Cross multiply
    72.10x = 108.21 × 43.24
  4. Step 4: Simplify right side
    72.10x = 4,679.00
  5. Step 5: Solve for x
    x = 4,679.00/72.10
  6. Step 6: Final answer
    x = 64.90

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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.