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Finding the Fourth Proportional to 1,639.40, 2,459.37 and 543.61

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Solution

The fourth proportional to 1,639.40, 2,459.37 and 543.61 is: 815.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.40 : 2,459.37 = 543.61 : x
  2. Step 2: Convert to fraction form
    1,639.40/2,459.37 = 543.61/x
  3. Step 3: Cross multiply
    1,639.40x = 2,459.37 × 543.61
  4. Step 4: Simplify right side
    1,639.40x = 1,336,925.83
  5. Step 5: Solve for x
    x = 1,336,925.83/1,639.40
  6. Step 6: Final answer
    x = 815.50

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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.