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Finding the Fourth Proportional to 1,911.70, 2,866.20 and 872.20

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Solution

The fourth proportional to 1,911.70, 2,866.20 and 872.20 is: 1,307.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.70 : 2,866.20 = 872.20 : x
  2. Step 2: Convert to fraction form
    1,911.70/2,866.20 = 872.20/x
  3. Step 3: Cross multiply
    1,911.70x = 2,866.20 × 872.20
  4. Step 4: Simplify right side
    1,911.70x = 2,499,899.64
  5. Step 5: Solve for x
    x = 2,499,899.64/1,911.70
  6. Step 6: Final answer
    x = 1,307.68

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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.