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Finding the Fourth Proportional to 43.23, 64.80 and 15.79

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Solution

The fourth proportional to 43.23, 64.80 and 15.79 is: 23.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.23 : 64.80 = 15.79 : x
  2. Step 2: Convert to fraction form
    43.23/64.80 = 15.79/x
  3. Step 3: Cross multiply
    43.23x = 64.80 × 15.79
  4. Step 4: Simplify right side
    43.23x = 1,023.19
  5. Step 5: Solve for x
    x = 1,023.19/43.23
  6. Step 6: Final answer
    x = 23.67

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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.