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Finding the Fourth Proportional to 892.21, 1,338.90 and 583.30

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Solution

The fourth proportional to 892.21, 1,338.90 and 583.30 is: 875.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.21 : 1,338.90 = 583.30 : x
  2. Step 2: Convert to fraction form
    892.21/1,338.90 = 583.30/x
  3. Step 3: Cross multiply
    892.21x = 1,338.90 × 583.30
  4. Step 4: Simplify right side
    892.21x = 780,980.37
  5. Step 5: Solve for x
    x = 780,980.37/892.21
  6. Step 6: Final answer
    x = 875.33

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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.