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Finding the Fourth Proportional to 2,807.43, 4,211.15 and 859.38

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Solution

The fourth proportional to 2,807.43, 4,211.15 and 859.38 is: 1,289.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,807.43 : 4,211.15 = 859.38 : x
  2. Step 2: Convert to fraction form
    2,807.43/4,211.15 = 859.38/x
  3. Step 3: Cross multiply
    2,807.43x = 4,211.15 × 859.38
  4. Step 4: Simplify right side
    2,807.43x = 3,618,973.79
  5. Step 5: Solve for x
    x = 3,618,973.79/2,807.43
  6. Step 6: Final answer
    x = 1,289.07

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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.