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Finding the Fourth Proportional to 1,392.41, 1,921.47 and 803

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Solution

The fourth proportional to 1,392.41, 1,921.47 and 803 is: 1,108.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.41 : 1,921.47 = 803 : x
  2. Step 2: Convert to fraction form
    1,392.41/1,921.47 = 803/x
  3. Step 3: Cross multiply
    1,392.41x = 1,921.47 × 803
  4. Step 4: Simplify right side
    1,392.41x = 1,542,940.41
  5. Step 5: Solve for x
    x = 1,542,940.41/1,392.41
  6. Step 6: Final answer
    x = 1,108.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.