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Finding the Fourth Proportional to 43.05, 64.50 and 21.35

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Solution

The fourth proportional to 43.05, 64.50 and 21.35 is: 31.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.05 : 64.50 = 21.35 : x
  2. Step 2: Convert to fraction form
    43.05/64.50 = 21.35/x
  3. Step 3: Cross multiply
    43.05x = 64.50 × 21.35
  4. Step 4: Simplify right side
    43.05x = 1,377.08
  5. Step 5: Solve for x
    x = 1,377.08/43.05
  6. Step 6: Final answer
    x = 31.99

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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.