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Finding the Fourth Proportional to 57.81, 86.58 and 45.71

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Solution

The fourth proportional to 57.81, 86.58 and 45.71 is: 68.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.81 : 86.58 = 45.71 : x
  2. Step 2: Convert to fraction form
    57.81/86.58 = 45.71/x
  3. Step 3: Cross multiply
    57.81x = 86.58 × 45.71
  4. Step 4: Simplify right side
    57.81x = 3,957.14
  5. Step 5: Solve for x
    x = 3,957.14/57.81
  6. Step 6: Final answer
    x = 68.45

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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.