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Finding the Fourth Proportional to 43.56, 64.90 and 40.84

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Solution

The fourth proportional to 43.56, 64.90 and 40.84 is: 60.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.56 : 64.90 = 40.84 : x
  2. Step 2: Convert to fraction form
    43.56/64.90 = 40.84/x
  3. Step 3: Cross multiply
    43.56x = 64.90 × 40.84
  4. Step 4: Simplify right side
    43.56x = 2,650.52
  5. Step 5: Solve for x
    x = 2,650.52/43.56
  6. Step 6: Final answer
    x = 60.85

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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.