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Finding the Fourth Proportional to 1,892.68, 2,839.16 and 660.40

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Solution

The fourth proportional to 1,892.68, 2,839.16 and 660.40 is: 990.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,892.68 : 2,839.16 = 660.40 : x
  2. Step 2: Convert to fraction form
    1,892.68/2,839.16 = 660.40/x
  3. Step 3: Cross multiply
    1,892.68x = 2,839.16 × 660.40
  4. Step 4: Simplify right side
    1,892.68x = 1,874,977.96
  5. Step 5: Solve for x
    x = 1,874,977.96/1,892.68
  6. Step 6: Final answer
    x = 990.65

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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.