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Finding the Fourth Proportional to 128,290.72, 192,297.84 and 72,856.48

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Solution

The fourth proportional to 128,290.72, 192,297.84 and 72,856.48 is: 109,206.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,290.72 : 192,297.84 = 72,856.48 : x
  2. Step 2: Convert to fraction form
    128,290.72/192,297.84 = 72,856.48/x
  3. Step 3: Cross multiply
    128,290.72x = 192,297.84 × 72,856.48
  4. Step 4: Simplify right side
    128,290.72x = 14,010,143,734.00
  5. Step 5: Solve for x
    x = 14,010,143,734.00/128,290.72
  6. Step 6: Final answer
    x = 109,206.21

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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.