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Finding the Fourth Proportional to 638,491.20, 957,866.40 and 217,809.60

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Solution

The fourth proportional to 638,491.20, 957,866.40 and 217,809.60 is: 326,758.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,491.20 : 957,866.40 = 217,809.60 : x
  2. Step 2: Convert to fraction form
    638,491.20/957,866.40 = 217,809.60/x
  3. Step 3: Cross multiply
    638,491.20x = 957,866.40 × 217,809.60
  4. Step 4: Simplify right side
    638,491.20x = 208,632,497,437.44
  5. Step 5: Solve for x
    x = 208,632,497,437.44/638,491.20
  6. Step 6: Final answer
    x = 326,758.61

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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.