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Finding the Fourth Proportional to 2,058, 2,839 and 1,218.12

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Solution

The fourth proportional to 2,058, 2,839 and 1,218.12 is: 1,680.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,058 : 2,839 = 1,218.12 : x
  2. Step 2: Convert to fraction form
    2,058/2,839 = 1,218.12/x
  3. Step 3: Cross multiply
    2,058x = 2,839 × 1,218.12
  4. Step 4: Simplify right side
    2,058x = 3,458,242.68
  5. Step 5: Solve for x
    x = 3,458,242.68/2,058
  6. Step 6: Final answer
    x = 1,680.39

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Half scale
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Double scale
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1.5x scale

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.