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Finding the Fourth Proportional to 128,399.63, 192,686.93 and 45,293.63

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Solution

The fourth proportional to 128,399.63, 192,686.93 and 45,293.63 is: 67,971.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,399.63 : 192,686.93 = 45,293.63 : x
  2. Step 2: Convert to fraction form
    128,399.63/192,686.93 = 45,293.63/x
  3. Step 3: Cross multiply
    128,399.63x = 192,686.93 × 45,293.63
  4. Step 4: Simplify right side
    128,399.63x = 8,727,489,323.35
  5. Step 5: Solve for x
    x = 8,727,489,323.35/128,399.63
  6. Step 6: Final answer
    x = 67,971.30

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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.