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Finding the Fourth Proportional to 1,639.70, 2,458.72 and 543.68

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Solution

The fourth proportional to 1,639.70, 2,458.72 and 543.68 is: 815.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.70 : 2,458.72 = 543.68 : x
  2. Step 2: Convert to fraction form
    1,639.70/2,458.72 = 543.68/x
  3. Step 3: Cross multiply
    1,639.70x = 2,458.72 × 543.68
  4. Step 4: Simplify right side
    1,639.70x = 1,336,756.89
  5. Step 5: Solve for x
    x = 1,336,756.89/1,639.70
  6. Step 6: Final answer
    x = 815.24

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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.