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Finding the Fourth Proportional to 1,026.80, 1,538.40 and 843.20

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Solution

The fourth proportional to 1,026.80, 1,538.40 and 843.20 is: 1,263.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,026.80 : 1,538.40 = 843.20 : x
  2. Step 2: Convert to fraction form
    1,026.80/1,538.40 = 843.20/x
  3. Step 3: Cross multiply
    1,026.80x = 1,538.40 × 843.20
  4. Step 4: Simplify right side
    1,026.80x = 1,297,178.88
  5. Step 5: Solve for x
    x = 1,297,178.88/1,026.80
  6. Step 6: Final answer
    x = 1,263.32

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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.