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Finding the Fourth Proportional to 85.71, 128.49 and 62.86

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Solution

The fourth proportional to 85.71, 128.49 and 62.86 is: 94.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.71 : 128.49 = 62.86 : x
  2. Step 2: Convert to fraction form
    85.71/128.49 = 62.86/x
  3. Step 3: Cross multiply
    85.71x = 128.49 × 62.86
  4. Step 4: Simplify right side
    85.71x = 8,076.56
  5. Step 5: Solve for x
    x = 8,076.56/85.71
  6. Step 6: Final answer
    x = 94.23

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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.