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Finding the Fourth Proportional to 128,051.80, 192,071.30 and 65,728.60

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Solution

The fourth proportional to 128,051.80, 192,071.30 and 65,728.60 is: 98,589.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,051.80 : 192,071.30 = 65,728.60 : x
  2. Step 2: Convert to fraction form
    128,051.80/192,071.30 = 65,728.60/x
  3. Step 3: Cross multiply
    128,051.80x = 192,071.30 × 65,728.60
  4. Step 4: Simplify right side
    128,051.80x = 12,624,577,649.18
  5. Step 5: Solve for x
    x = 12,624,577,649.18/128,051.80
  6. Step 6: Final answer
    x = 98,589.61

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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.