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Finding the Fourth Proportional to 1,373, 1,894.98 and 821

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Solution

The fourth proportional to 1,373, 1,894.98 and 821 is: 1,133.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,373 : 1,894.98 = 821 : x
  2. Step 2: Convert to fraction form
    1,373/1,894.98 = 821/x
  3. Step 3: Cross multiply
    1,373x = 1,894.98 × 821
  4. Step 4: Simplify right side
    1,373x = 1,555,778.58
  5. Step 5: Solve for x
    x = 1,555,778.58/1,373
  6. Step 6: Final answer
    x = 1,133.12

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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.