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Finding the Fourth Proportional to 2,812.98, 4,220.19 and 865.38

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Solution

The fourth proportional to 2,812.98, 4,220.19 and 865.38 is: 1,298.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.98 : 4,220.19 = 865.38 : x
  2. Step 2: Convert to fraction form
    2,812.98/4,220.19 = 865.38/x
  3. Step 3: Cross multiply
    2,812.98x = 4,220.19 × 865.38
  4. Step 4: Simplify right side
    2,812.98x = 3,652,068.02
  5. Step 5: Solve for x
    x = 3,652,068.02/2,812.98
  6. Step 6: Final answer
    x = 1,298.29

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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.