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Finding the Fourth Proportional to 43.16, 64.79 and 39.84

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Solution

The fourth proportional to 43.16, 64.79 and 39.84 is: 59.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.16 : 64.79 = 39.84 : x
  2. Step 2: Convert to fraction form
    43.16/64.79 = 39.84/x
  3. Step 3: Cross multiply
    43.16x = 64.79 × 39.84
  4. Step 4: Simplify right side
    43.16x = 2,581.23
  5. Step 5: Solve for x
    x = 2,581.23/43.16
  6. Step 6: Final answer
    x = 59.81

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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.