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Finding the Fourth Proportional to 1,392.39, 1,920.81 and 994.11

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Solution

The fourth proportional to 1,392.39, 1,920.81 and 994.11 is: 1,371.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.39 : 1,920.81 = 994.11 : x
  2. Step 2: Convert to fraction form
    1,392.39/1,920.81 = 994.11/x
  3. Step 3: Cross multiply
    1,392.39x = 1,920.81 × 994.11
  4. Step 4: Simplify right side
    1,392.39x = 1,909,492.95
  5. Step 5: Solve for x
    x = 1,909,492.95/1,392.39
  6. Step 6: Final answer
    x = 1,371.38

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1.5x scale

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.