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Finding the Fourth Proportional to 85,939.62, 128,915.55 and 36,012.43

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Solution

The fourth proportional to 85,939.62, 128,915.55 and 36,012.43 is: 54,021.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,939.62 : 128,915.55 = 36,012.43 : x
  2. Step 2: Convert to fraction form
    85,939.62/128,915.55 = 36,012.43/x
  3. Step 3: Cross multiply
    85,939.62x = 128,915.55 × 36,012.43
  4. Step 4: Simplify right side
    85,939.62x = 4,642,562,381.43
  5. Step 5: Solve for x
    x = 4,642,562,381.43/85,939.62
  6. Step 6: Final answer
    x = 54,021.21

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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.