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Finding the Fourth Proportional to 2,859.10, 4,288.65 and 911.25

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Solution

The fourth proportional to 2,859.10, 4,288.65 and 911.25 is: 1,366.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,859.10 : 4,288.65 = 911.25 : x
  2. Step 2: Convert to fraction form
    2,859.10/4,288.65 = 911.25/x
  3. Step 3: Cross multiply
    2,859.10x = 4,288.65 × 911.25
  4. Step 4: Simplify right side
    2,859.10x = 3,908,028.90
  5. Step 5: Solve for x
    x = 3,908,028.90/2,859.10
  6. Step 6: Final answer
    x = 1,366.88

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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.