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Finding the Fourth Proportional to 1,554.39, 2,144.99 and 890.78

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Solution

The fourth proportional to 1,554.39, 2,144.99 and 890.78 is: 1,229.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,554.39 : 2,144.99 = 890.78 : x
  2. Step 2: Convert to fraction form
    1,554.39/2,144.99 = 890.78/x
  3. Step 3: Cross multiply
    1,554.39x = 2,144.99 × 890.78
  4. Step 4: Simplify right side
    1,554.39x = 1,910,713.74
  5. Step 5: Solve for x
    x = 1,910,713.74/1,554.39
  6. Step 6: Final answer
    x = 1,229.24

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Double scale
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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.