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Finding the Fourth Proportional to 1,639.22, 2,459.10 and 543.65

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Solution

The fourth proportional to 1,639.22, 2,459.10 and 543.65 is: 815.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.22 : 2,459.10 = 543.65 : x
  2. Step 2: Convert to fraction form
    1,639.22/2,459.10 = 543.65/x
  3. Step 3: Cross multiply
    1,639.22x = 2,459.10 × 543.65
  4. Step 4: Simplify right side
    1,639.22x = 1,336,889.72
  5. Step 5: Solve for x
    x = 1,336,889.72/1,639.22
  6. Step 6: Final answer
    x = 815.56

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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.