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Finding the Fourth Proportional to 1,857.40, 2,786.10 and 1,511.80

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Solution

The fourth proportional to 1,857.40, 2,786.10 and 1,511.80 is: 2,267.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.40 : 2,786.10 = 1,511.80 : x
  2. Step 2: Convert to fraction form
    1,857.40/2,786.10 = 1,511.80/x
  3. Step 3: Cross multiply
    1,857.40x = 2,786.10 × 1,511.80
  4. Step 4: Simplify right side
    1,857.40x = 4,212,025.98
  5. Step 5: Solve for x
    x = 4,212,025.98/1,857.40
  6. Step 6: Final answer
    x = 2,267.70

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1.5x scale

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.