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Finding the Fourth Proportional to 1,485.78, 2,050.39 and 822.61

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Solution

The fourth proportional to 1,485.78, 2,050.39 and 822.61 is: 1,135.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.78 : 2,050.39 = 822.61 : x
  2. Step 2: Convert to fraction form
    1,485.78/2,050.39 = 822.61/x
  3. Step 3: Cross multiply
    1,485.78x = 2,050.39 × 822.61
  4. Step 4: Simplify right side
    1,485.78x = 1,686,671.32
  5. Step 5: Solve for x
    x = 1,686,671.32/1,485.78
  6. Step 6: Final answer
    x = 1,135.21

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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.