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Finding the Fourth Proportional to 1,638.83, 2,458.61 and 543.20

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Solution

The fourth proportional to 1,638.83, 2,458.61 and 543.20 is: 814.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.83 : 2,458.61 = 543.20 : x
  2. Step 2: Convert to fraction form
    1,638.83/2,458.61 = 543.20/x
  3. Step 3: Cross multiply
    1,638.83x = 2,458.61 × 543.20
  4. Step 4: Simplify right side
    1,638.83x = 1,335,501.94
  5. Step 5: Solve for x
    x = 1,335,501.94/1,638.83
  6. Step 6: Final answer
    x = 814.91

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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.