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Finding the Fourth Proportional to 85,367.72, 128,048.85 and 38,620.60

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Solution

The fourth proportional to 85,367.72, 128,048.85 and 38,620.60 is: 57,929.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,367.72 : 128,048.85 = 38,620.60 : x
  2. Step 2: Convert to fraction form
    85,367.72/128,048.85 = 38,620.60/x
  3. Step 3: Cross multiply
    85,367.72x = 128,048.85 × 38,620.60
  4. Step 4: Simplify right side
    85,367.72x = 4,945,323,096.19
  5. Step 5: Solve for x
    x = 4,945,323,096.19/85,367.72
  6. Step 6: Final answer
    x = 57,929.66

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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.