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Finding the Fourth Proportional to 1,874.88, 2,811.12 and 720

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Solution

The fourth proportional to 1,874.88, 2,811.12 and 720 is: 1,079.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,874.88 : 2,811.12 = 720 : x
  2. Step 2: Convert to fraction form
    1,874.88/2,811.12 = 720/x
  3. Step 3: Cross multiply
    1,874.88x = 2,811.12 × 720
  4. Step 4: Simplify right side
    1,874.88x = 2,024,006.40
  5. Step 5: Solve for x
    x = 2,024,006.40/1,874.88
  6. Step 6: Final answer
    x = 1,079.54

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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.