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Finding the Fourth Proportional to 1,845.80, 2,769 and 921.40

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Solution

The fourth proportional to 1,845.80, 2,769 and 921.40 is: 1,382.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,845.80 : 2,769 = 921.40 : x
  2. Step 2: Convert to fraction form
    1,845.80/2,769 = 921.40/x
  3. Step 3: Cross multiply
    1,845.80x = 2,769 × 921.40
  4. Step 4: Simplify right side
    1,845.80x = 2,551,356.60
  5. Step 5: Solve for x
    x = 2,551,356.60/1,845.80
  6. Step 6: Final answer
    x = 1,382.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.