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Finding the Fourth Proportional to 1,347.87, 2,020.80 and 422.90

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Solution

The fourth proportional to 1,347.87, 2,020.80 and 422.90 is: 634.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.87 : 2,020.80 = 422.90 : x
  2. Step 2: Convert to fraction form
    1,347.87/2,020.80 = 422.90/x
  3. Step 3: Cross multiply
    1,347.87x = 2,020.80 × 422.90
  4. Step 4: Simplify right side
    1,347.87x = 854,587.32
  5. Step 5: Solve for x
    x = 854,587.32/1,347.87
  6. Step 6: Final answer
    x = 634.03

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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.