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Finding the Fourth Proportional to 2,807.53, 4,211.43 and 859.75

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Solution

The fourth proportional to 2,807.53, 4,211.43 and 859.75 is: 1,289.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,807.53 : 4,211.43 = 859.75 : x
  2. Step 2: Convert to fraction form
    2,807.53/4,211.43 = 859.75/x
  3. Step 3: Cross multiply
    2,807.53x = 4,211.43 × 859.75
  4. Step 4: Simplify right side
    2,807.53x = 3,620,776.94
  5. Step 5: Solve for x
    x = 3,620,776.94/2,807.53
  6. Step 6: Final answer
    x = 1,289.67

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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.