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Finding the Fourth Proportional to 1,638.56, 2,458.20 and 543.08

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Solution

The fourth proportional to 1,638.56, 2,458.20 and 543.08 is: 814.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.56 : 2,458.20 = 543.08 : x
  2. Step 2: Convert to fraction form
    1,638.56/2,458.20 = 543.08/x
  3. Step 3: Cross multiply
    1,638.56x = 2,458.20 × 543.08
  4. Step 4: Simplify right side
    1,638.56x = 1,334,999.26
  5. Step 5: Solve for x
    x = 1,334,999.26/1,638.56
  6. Step 6: Final answer
    x = 814.74

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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.