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Finding the Fourth Proportional to 85,400.47, 128,105.37 and 35,485.60

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Solution

The fourth proportional to 85,400.47, 128,105.37 and 35,485.60 is: 53,230.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,400.47 : 128,105.37 = 35,485.60 : x
  2. Step 2: Convert to fraction form
    85,400.47/128,105.37 = 35,485.60/x
  3. Step 3: Cross multiply
    85,400.47x = 128,105.37 × 35,485.60
  4. Step 4: Simplify right side
    85,400.47x = 4,545,895,917.67
  5. Step 5: Solve for x
    x = 4,545,895,917.67/85,400.47
  6. Step 6: Final answer
    x = 53,230.34

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1.5x scale

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.