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Finding the Fourth Proportional to 128,079.06, 192,118.59 and 65,709.78

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Solution

The fourth proportional to 128,079.06, 192,118.59 and 65,709.78 is: 98,564.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,079.06 : 192,118.59 = 65,709.78 : x
  2. Step 2: Convert to fraction form
    128,079.06/192,118.59 = 65,709.78/x
  3. Step 3: Cross multiply
    128,079.06x = 192,118.59 × 65,709.78
  4. Step 4: Simplify right side
    128,079.06x = 12,624,070,282.81
  5. Step 5: Solve for x
    x = 12,624,070,282.81/128,079.06
  6. Step 6: Final answer
    x = 98,564.67

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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.