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Finding the Fourth Proportional to 98,143.63, 135,440.03 and 55,704.89

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Solution

The fourth proportional to 98,143.63, 135,440.03 and 55,704.89 is: 76,873.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,143.63 : 135,440.03 = 55,704.89 : x
  2. Step 2: Convert to fraction form
    98,143.63/135,440.03 = 55,704.89/x
  3. Step 3: Cross multiply
    98,143.63x = 135,440.03 × 55,704.89
  4. Step 4: Simplify right side
    98,143.63x = 7,544,671,694.22
  5. Step 5: Solve for x
    x = 7,544,671,694.22/98,143.63
  6. Step 6: Final answer
    x = 76,873.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.