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Finding the Fourth Proportional to 1,392.54, 1,920.50 and 1,172

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Solution

The fourth proportional to 1,392.54, 1,920.50 and 1,172 is: 1,616.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.54 : 1,920.50 = 1,172 : x
  2. Step 2: Convert to fraction form
    1,392.54/1,920.50 = 1,172/x
  3. Step 3: Cross multiply
    1,392.54x = 1,920.50 × 1,172
  4. Step 4: Simplify right side
    1,392.54x = 2,250,826
  5. Step 5: Solve for x
    x = 2,250,826/1,392.54
  6. Step 6: Final answer
    x = 1,616.35

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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.