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Finding the Fourth Proportional to 128,136.10, 191,912.55 and 65,733.70

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Solution

The fourth proportional to 128,136.10, 191,912.55 and 65,733.70 is: 98,450.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,136.10 : 191,912.55 = 65,733.70 : x
  2. Step 2: Convert to fraction form
    128,136.10/191,912.55 = 65,733.70/x
  3. Step 3: Cross multiply
    128,136.10x = 191,912.55 × 65,733.70
  4. Step 4: Simplify right side
    128,136.10x = 12,615,121,987.94
  5. Step 5: Solve for x
    x = 12,615,121,987.94/128,136.10
  6. Step 6: Final answer
    x = 98,450.96

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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.