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Finding the Fourth Proportional to 71.35, 107.03 and 20.00

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Solution

The fourth proportional to 71.35, 107.03 and 20.00 is: 29.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.35 : 107.03 = 20.00 : x
  2. Step 2: Convert to fraction form
    71.35/107.03 = 20.00/x
  3. Step 3: Cross multiply
    71.35x = 107.03 × 20.00
  4. Step 4: Simplify right side
    71.35x = 2,140.06
  5. Step 5: Solve for x
    x = 2,140.06/71.35
  6. Step 6: Final answer
    x = 29.99

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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.