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Finding the Fourth Proportional to 1,674.80, 2,511.90 and 1,057.40

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Solution

The fourth proportional to 1,674.80, 2,511.90 and 1,057.40 is: 1,585.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,674.80 : 2,511.90 = 1,057.40 : x
  2. Step 2: Convert to fraction form
    1,674.80/2,511.90 = 1,057.40/x
  3. Step 3: Cross multiply
    1,674.80x = 2,511.90 × 1,057.40
  4. Step 4: Simplify right side
    1,674.80x = 2,656,083.06
  5. Step 5: Solve for x
    x = 2,656,083.06/1,674.80
  6. Step 6: Final answer
    x = 1,585.91

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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.