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Finding the Fourth Proportional to 90,731, 136,133.72 and 40,103.26

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Solution

The fourth proportional to 90,731, 136,133.72 and 40,103.26 is: 60,171.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,731 : 136,133.72 = 40,103.26 : x
  2. Step 2: Convert to fraction form
    90,731/136,133.72 = 40,103.26/x
  3. Step 3: Cross multiply
    90,731x = 136,133.72 × 40,103.26
  4. Step 4: Simplify right side
    90,731x = 5,459,405,967.93
  5. Step 5: Solve for x
    x = 5,459,405,967.93/90,731
  6. Step 6: Final answer
    x = 60,171.34

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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.