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Finding the Fourth Proportional to 128,056.80, 192,085.20 and 75,525.60

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Solution

The fourth proportional to 128,056.80, 192,085.20 and 75,525.60 is: 113,288.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,056.80 : 192,085.20 = 75,525.60 : x
  2. Step 2: Convert to fraction form
    128,056.80/192,085.20 = 75,525.60/x
  3. Step 3: Cross multiply
    128,056.80x = 192,085.20 × 75,525.60
  4. Step 4: Simplify right side
    128,056.80x = 14,507,349,981.12
  5. Step 5: Solve for x
    x = 14,507,349,981.12/128,056.80
  6. Step 6: Final answer
    x = 113,288.40

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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.