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Finding the Fourth Proportional to 1,149.08, 1,721.81 and 839.51

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Solution

The fourth proportional to 1,149.08, 1,721.81 and 839.51 is: 1,257.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,149.08 : 1,721.81 = 839.51 : x
  2. Step 2: Convert to fraction form
    1,149.08/1,721.81 = 839.51/x
  3. Step 3: Cross multiply
    1,149.08x = 1,721.81 × 839.51
  4. Step 4: Simplify right side
    1,149.08x = 1,445,468.10
  5. Step 5: Solve for x
    x = 1,445,468.10/1,149.08
  6. Step 6: Final answer
    x = 1,257.94

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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.