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Finding the Fourth Proportional to 85.43, 128.19 and 62.54

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Solution

The fourth proportional to 85.43, 128.19 and 62.54 is: 93.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.43 : 128.19 = 62.54 : x
  2. Step 2: Convert to fraction form
    85.43/128.19 = 62.54/x
  3. Step 3: Cross multiply
    85.43x = 128.19 × 62.54
  4. Step 4: Simplify right side
    85.43x = 8,017.80
  5. Step 5: Solve for x
    x = 8,017.80/85.43
  6. Step 6: Final answer
    x = 93.86

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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.