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Finding the Fourth Proportional to 43.28, 65.18 and 39.59

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Solution

The fourth proportional to 43.28, 65.18 and 39.59 is: 59.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.28 : 65.18 = 39.59 : x
  2. Step 2: Convert to fraction form
    43.28/65.18 = 39.59/x
  3. Step 3: Cross multiply
    43.28x = 65.18 × 39.59
  4. Step 4: Simplify right side
    43.28x = 2,580.48
  5. Step 5: Solve for x
    x = 2,580.48/43.28
  6. Step 6: Final answer
    x = 59.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.