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Finding the Fourth Proportional to 1,639.18, 2,458.95 and 543.46

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Solution

The fourth proportional to 1,639.18, 2,458.95 and 543.46 is: 815.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.18 : 2,458.95 = 543.46 : x
  2. Step 2: Convert to fraction form
    1,639.18/2,458.95 = 543.46/x
  3. Step 3: Cross multiply
    1,639.18x = 2,458.95 × 543.46
  4. Step 4: Simplify right side
    1,639.18x = 1,336,340.97
  5. Step 5: Solve for x
    x = 1,336,340.97/1,639.18
  6. Step 6: Final answer
    x = 815.25

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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.