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Finding the Fourth Proportional to 128,309.76, 192,481.92 and 45,184.32

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Solution

The fourth proportional to 128,309.76, 192,481.92 and 45,184.32 is: 67,782.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,309.76 : 192,481.92 = 45,184.32 : x
  2. Step 2: Convert to fraction form
    128,309.76/192,481.92 = 45,184.32/x
  3. Step 3: Cross multiply
    128,309.76x = 192,481.92 × 45,184.32
  4. Step 4: Simplify right side
    128,309.76x = 8,697,164,667.49
  5. Step 5: Solve for x
    x = 8,697,164,667.49/128,309.76
  6. Step 6: Final answer
    x = 67,782.57

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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.