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Finding the Fourth Proportional to 57.65, 85.89 and 55.80

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Solution

The fourth proportional to 57.65, 85.89 and 55.80 is: 83.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.65 : 85.89 = 55.80 : x
  2. Step 2: Convert to fraction form
    57.65/85.89 = 55.80/x
  3. Step 3: Cross multiply
    57.65x = 85.89 × 55.80
  4. Step 4: Simplify right side
    57.65x = 4,792.87
  5. Step 5: Solve for x
    x = 4,792.87/57.65
  6. Step 6: Final answer
    x = 83.14

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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.