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Finding the Fourth Proportional to 135,838.72, 203,679.06 and 90,911.36

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Solution

The fourth proportional to 135,838.72, 203,679.06 and 90,911.36 is: 136,314.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,838.72 : 203,679.06 = 90,911.36 : x
  2. Step 2: Convert to fraction form
    135,838.72/203,679.06 = 90,911.36/x
  3. Step 3: Cross multiply
    135,838.72x = 203,679.06 × 90,911.36
  4. Step 4: Simplify right side
    135,838.72x = 18,516,740,516.40
  5. Step 5: Solve for x
    x = 18,516,740,516.40/135,838.72
  6. Step 6: Final answer
    x = 136,314.16

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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.