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Finding the Fourth Proportional to 128,002.40, 192,099.60 and 65,640.80

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Solution

The fourth proportional to 128,002.40, 192,099.60 and 65,640.80 is: 98,510.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,002.40 : 192,099.60 = 65,640.80 : x
  2. Step 2: Convert to fraction form
    128,002.40/192,099.60 = 65,640.80/x
  3. Step 3: Cross multiply
    128,002.40x = 192,099.60 × 65,640.80
  4. Step 4: Simplify right side
    128,002.40x = 12,609,571,423.68
  5. Step 5: Solve for x
    x = 12,609,571,423.68/128,002.40
  6. Step 6: Final answer
    x = 98,510.43

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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.