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Finding the Fourth Proportional to 1,490.80, 2,057.40 and 861.43

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Solution

The fourth proportional to 1,490.80, 2,057.40 and 861.43 is: 1,188.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.80 : 2,057.40 = 861.43 : x
  2. Step 2: Convert to fraction form
    1,490.80/2,057.40 = 861.43/x
  3. Step 3: Cross multiply
    1,490.80x = 2,057.40 × 861.43
  4. Step 4: Simplify right side
    1,490.80x = 1,772,306.08
  5. Step 5: Solve for x
    x = 1,772,306.08/1,490.80
  6. Step 6: Final answer
    x = 1,188.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.