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Finding the Fourth Proportional to 1,908.43, 2,864.13 and 921.45

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Solution

The fourth proportional to 1,908.43, 2,864.13 and 921.45 is: 1,382.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,908.43 : 2,864.13 = 921.45 : x
  2. Step 2: Convert to fraction form
    1,908.43/2,864.13 = 921.45/x
  3. Step 3: Cross multiply
    1,908.43x = 2,864.13 × 921.45
  4. Step 4: Simplify right side
    1,908.43x = 2,639,152.59
  5. Step 5: Solve for x
    x = 2,639,152.59/1,908.43
  6. Step 6: Final answer
    x = 1,382.89

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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.