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Finding the Fourth Proportional to 85,605.53, 128,425.79 and 29,438.34

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Solution

The fourth proportional to 85,605.53, 128,425.79 and 29,438.34 is: 44,163.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,605.53 : 128,425.79 = 29,438.34 : x
  2. Step 2: Convert to fraction form
    85,605.53/128,425.79 = 29,438.34/x
  3. Step 3: Cross multiply
    85,605.53x = 128,425.79 × 29,438.34
  4. Step 4: Simplify right side
    85,605.53x = 3,780,641,662.79
  5. Step 5: Solve for x
    x = 3,780,641,662.79/85,605.53
  6. Step 6: Final answer
    x = 44,163.52

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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.