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Finding the Fourth Proportional to 128,600.48, 177,391.20 and 84,993.20

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Solution

The fourth proportional to 128,600.48, 177,391.20 and 84,993.20 is: 117,239.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,600.48 : 177,391.20 = 84,993.20 : x
  2. Step 2: Convert to fraction form
    128,600.48/177,391.20 = 84,993.20/x
  3. Step 3: Cross multiply
    128,600.48x = 177,391.20 × 84,993.20
  4. Step 4: Simplify right side
    128,600.48x = 15,077,045,739.84
  5. Step 5: Solve for x
    x = 15,077,045,739.84/128,600.48
  6. Step 6: Final answer
    x = 117,239.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.