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Finding the Fourth Proportional to 638,000.20, 957,129.90 and 217,318.60

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Solution

The fourth proportional to 638,000.20, 957,129.90 and 217,318.60 is: 326,022.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,000.20 : 957,129.90 = 217,318.60 : x
  2. Step 2: Convert to fraction form
    638,000.20/957,129.90 = 217,318.60/x
  3. Step 3: Cross multiply
    638,000.20x = 957,129.90 × 217,318.60
  4. Step 4: Simplify right side
    638,000.20x = 208,002,129,886.14
  5. Step 5: Solve for x
    x = 208,002,129,886.14/638,000.20
  6. Step 6: Final answer
    x = 326,022.04

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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.