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Finding the Fourth Proportional to 43.21, 64.51 and 35.61

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Solution

The fourth proportional to 43.21, 64.51 and 35.61 is: 53.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.21 : 64.51 = 35.61 : x
  2. Step 2: Convert to fraction form
    43.21/64.51 = 35.61/x
  3. Step 3: Cross multiply
    43.21x = 64.51 × 35.61
  4. Step 4: Simplify right side
    43.21x = 2,297.20
  5. Step 5: Solve for x
    x = 2,297.20/43.21
  6. Step 6: Final answer
    x = 53.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.