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Finding the Fourth Proportional to 52.87, 79.32 and 20.83

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Solution

The fourth proportional to 52.87, 79.32 and 20.83 is: 31.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.87 : 79.32 = 20.83 : x
  2. Step 2: Convert to fraction form
    52.87/79.32 = 20.83/x
  3. Step 3: Cross multiply
    52.87x = 79.32 × 20.83
  4. Step 4: Simplify right side
    52.87x = 1,651.96
  5. Step 5: Solve for x
    x = 1,651.96/52.87
  6. Step 6: Final answer
    x = 31.25

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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.