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Finding the Fourth Proportional to 1,549.81, 2,138.50 and 990.78

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Solution

The fourth proportional to 1,549.81, 2,138.50 and 990.78 is: 1,367.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,549.81 : 2,138.50 = 990.78 : x
  2. Step 2: Convert to fraction form
    1,549.81/2,138.50 = 990.78/x
  3. Step 3: Cross multiply
    1,549.81x = 2,138.50 × 990.78
  4. Step 4: Simplify right side
    1,549.81x = 2,118,783.03
  5. Step 5: Solve for x
    x = 2,118,783.03/1,549.81
  6. Step 6: Final answer
    x = 1,367.12

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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.