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Finding the Fourth Proportional to 1,485, 2,049.84 and 1,020.60

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Solution

The fourth proportional to 1,485, 2,049.84 and 1,020.60 is: 1,408.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485 : 2,049.84 = 1,020.60 : x
  2. Step 2: Convert to fraction form
    1,485/2,049.84 = 1,020.60/x
  3. Step 3: Cross multiply
    1,485x = 2,049.84 × 1,020.60
  4. Step 4: Simplify right side
    1,485x = 2,092,066.70
  5. Step 5: Solve for x
    x = 2,092,066.70/1,485
  6. Step 6: Final answer
    x = 1,408.80

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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.