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Finding the Fourth Proportional to 1,865.15, 2,798.70 and 825.87

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Solution

The fourth proportional to 1,865.15, 2,798.70 and 825.87 is: 1,239.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,865.15 : 2,798.70 = 825.87 : x
  2. Step 2: Convert to fraction form
    1,865.15/2,798.70 = 825.87/x
  3. Step 3: Cross multiply
    1,865.15x = 2,798.70 × 825.87
  4. Step 4: Simplify right side
    1,865.15x = 2,311,346.31
  5. Step 5: Solve for x
    x = 2,311,346.31/1,865.15
  6. Step 6: Final answer
    x = 1,239.23

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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.