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Finding the Fourth Proportional to 1,638.90, 2,458.62 and 543.11

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Solution

The fourth proportional to 1,638.90, 2,458.62 and 543.11 is: 814.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.90 : 2,458.62 = 543.11 : x
  2. Step 2: Convert to fraction form
    1,638.90/2,458.62 = 543.11/x
  3. Step 3: Cross multiply
    1,638.90x = 2,458.62 × 543.11
  4. Step 4: Simplify right side
    1,638.90x = 1,335,288.82
  5. Step 5: Solve for x
    x = 1,335,288.82/1,638.90
  6. Step 6: Final answer
    x = 814.75

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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.