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Finding the Fourth Proportional to 208,432.72, 312,652.15 and 66,299.93

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Solution

The fourth proportional to 208,432.72, 312,652.15 and 66,299.93 is: 99,450.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,432.72 : 312,652.15 = 66,299.93 : x
  2. Step 2: Convert to fraction form
    208,432.72/312,652.15 = 66,299.93/x
  3. Step 3: Cross multiply
    208,432.72x = 312,652.15 × 66,299.93
  4. Step 4: Simplify right side
    208,432.72x = 20,728,815,915.39
  5. Step 5: Solve for x
    x = 20,728,815,915.39/208,432.72
  6. Step 6: Final answer
    x = 99,450.87

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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.