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Finding the Fourth Proportional to 90,856, 125,381.36 and 51,112

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Solution

The fourth proportional to 90,856, 125,381.36 and 51,112 is: 70,534.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,856 : 125,381.36 = 51,112 : x
  2. Step 2: Convert to fraction form
    90,856/125,381.36 = 51,112/x
  3. Step 3: Cross multiply
    90,856x = 125,381.36 × 51,112
  4. Step 4: Simplify right side
    90,856x = 6,408,492,072.32
  5. Step 5: Solve for x
    x = 6,408,492,072.32/90,856
  6. Step 6: Final answer
    x = 70,534.61

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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.