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Finding the Fourth Proportional to 1,619.42, 2,234.78 and 920.79

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Solution

The fourth proportional to 1,619.42, 2,234.78 and 920.79 is: 1,270.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,619.42 : 2,234.78 = 920.79 : x
  2. Step 2: Convert to fraction form
    1,619.42/2,234.78 = 920.79/x
  3. Step 3: Cross multiply
    1,619.42x = 2,234.78 × 920.79
  4. Step 4: Simplify right side
    1,619.42x = 2,057,763.08
  5. Step 5: Solve for x
    x = 2,057,763.08/1,619.42
  6. Step 6: Final answer
    x = 1,270.68

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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.