Home / 20,972.28-31,458.42-18,892.20

Finding the Fourth Proportional to 20,972.28, 31,458.42 and 18,892.20

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Solution

The fourth proportional to 20,972.28, 31,458.42 and 18,892.20 is: 28,338.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.28 : 31,458.42 = 18,892.20 : x
  2. Step 2: Convert to fraction form
    20,972.28/31,458.42 = 18,892.20/x
  3. Step 3: Cross multiply
    20,972.28x = 31,458.42 × 18,892.20
  4. Step 4: Simplify right side
    20,972.28x = 594,318,762.32
  5. Step 5: Solve for x
    x = 594,318,762.32/20,972.28
  6. Step 6: Final answer
    x = 28,338.30

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Similar ratio
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1.5x scale

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.