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Finding the Fourth Proportional to 1,662.60, 2,490.78 and 1,390.44

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Solution

The fourth proportional to 1,662.60, 2,490.78 and 1,390.44 is: 2,083.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,662.60 : 2,490.78 = 1,390.44 : x
  2. Step 2: Convert to fraction form
    1,662.60/2,490.78 = 1,390.44/x
  3. Step 3: Cross multiply
    1,662.60x = 2,490.78 × 1,390.44
  4. Step 4: Simplify right side
    1,662.60x = 3,463,280.14
  5. Step 5: Solve for x
    x = 3,463,280.14/1,662.60
  6. Step 6: Final answer
    x = 2,083.05

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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.