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Finding the Fourth Proportional to 1,549.65, 2,138.50 and 841.48

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Solution

The fourth proportional to 1,549.65, 2,138.50 and 841.48 is: 1,161.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,549.65 : 2,138.50 = 841.48 : x
  2. Step 2: Convert to fraction form
    1,549.65/2,138.50 = 841.48/x
  3. Step 3: Cross multiply
    1,549.65x = 2,138.50 × 841.48
  4. Step 4: Simplify right side
    1,549.65x = 1,799,504.98
  5. Step 5: Solve for x
    x = 1,799,504.98/1,549.65
  6. Step 6: Final answer
    x = 1,161.23

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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.