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Finding the Fourth Proportional to 57.00, 85.51 and 20.93

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Solution

The fourth proportional to 57.00, 85.51 and 20.93 is: 31.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.00 : 85.51 = 20.93 : x
  2. Step 2: Convert to fraction form
    57.00/85.51 = 20.93/x
  3. Step 3: Cross multiply
    57.00x = 85.51 × 20.93
  4. Step 4: Simplify right side
    57.00x = 1,789.41
  5. Step 5: Solve for x
    x = 1,789.41/57.00
  6. Step 6: Final answer
    x = 31.40

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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.