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Finding the Fourth Proportional to 1,662.84, 2,490.37 and 839.11

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Solution

The fourth proportional to 1,662.84, 2,490.37 and 839.11 is: 1,256.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,662.84 : 2,490.37 = 839.11 : x
  2. Step 2: Convert to fraction form
    1,662.84/2,490.37 = 839.11/x
  3. Step 3: Cross multiply
    1,662.84x = 2,490.37 × 839.11
  4. Step 4: Simplify right side
    1,662.84x = 2,089,693.08
  5. Step 5: Solve for x
    x = 2,089,693.08/1,662.84
  6. Step 6: Final answer
    x = 1,256.70

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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.