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Finding the Fourth Proportional to 85,845.80, 128,807.10 and 39,074.60

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Solution

The fourth proportional to 85,845.80, 128,807.10 and 39,074.60 is: 58,629.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,845.80 : 128,807.10 = 39,074.60 : x
  2. Step 2: Convert to fraction form
    85,845.80/128,807.10 = 39,074.60/x
  3. Step 3: Cross multiply
    85,845.80x = 128,807.10 × 39,074.60
  4. Step 4: Simplify right side
    85,845.80x = 5,033,085,909.66
  5. Step 5: Solve for x
    x = 5,033,085,909.66/85,845.80
  6. Step 6: Final answer
    x = 58,629.38

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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.