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Finding the Fourth Proportional to 1,392.80, 1,922.67 and 920.95

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Solution

The fourth proportional to 1,392.80, 1,922.67 and 920.95 is: 1,271.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.80 : 1,922.67 = 920.95 : x
  2. Step 2: Convert to fraction form
    1,392.80/1,922.67 = 920.95/x
  3. Step 3: Cross multiply
    1,392.80x = 1,922.67 × 920.95
  4. Step 4: Simplify right side
    1,392.80x = 1,770,678.13
  5. Step 5: Solve for x
    x = 1,770,678.13/1,392.80
  6. Step 6: Final answer
    x = 1,271.31

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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.