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Finding the Fourth Proportional to 1,322.39, 1,982.90 and 581.70

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Solution

The fourth proportional to 1,322.39, 1,982.90 and 581.70 is: 872.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.39 : 1,982.90 = 581.70 : x
  2. Step 2: Convert to fraction form
    1,322.39/1,982.90 = 581.70/x
  3. Step 3: Cross multiply
    1,322.39x = 1,982.90 × 581.70
  4. Step 4: Simplify right side
    1,322.39x = 1,153,450.02
  5. Step 5: Solve for x
    x = 1,153,450.02/1,322.39
  6. Step 6: Final answer
    x = 872.25

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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.