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Finding the Fourth Proportional to 85,956.42, 128,940.66 and 35,986.08

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Solution

The fourth proportional to 85,956.42, 128,940.66 and 35,986.08 is: 53,981.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,956.42 : 128,940.66 = 35,986.08 : x
  2. Step 2: Convert to fraction form
    85,956.42/128,940.66 = 35,986.08/x
  3. Step 3: Cross multiply
    85,956.42x = 128,940.66 × 35,986.08
  4. Step 4: Simplify right side
    85,956.42x = 4,640,068,906.01
  5. Step 5: Solve for x
    x = 4,640,068,906.01/85,956.42
  6. Step 6: Final answer
    x = 53,981.64

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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.