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Finding the Fourth Proportional to 2,072.84, 3,109.28 and 840

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Solution

The fourth proportional to 2,072.84, 3,109.28 and 840 is: 1,260.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,072.84 : 3,109.28 = 840 : x
  2. Step 2: Convert to fraction form
    2,072.84/3,109.28 = 840/x
  3. Step 3: Cross multiply
    2,072.84x = 3,109.28 × 840
  4. Step 4: Simplify right side
    2,072.84x = 2,611,795.20
  5. Step 5: Solve for x
    x = 2,611,795.20/2,072.84
  6. Step 6: Final answer
    x = 1,260.01

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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.