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Finding the Fourth Proportional to 51,388.90, 70,928.10 and 31,241.50

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Solution

The fourth proportional to 51,388.90, 70,928.10 and 31,241.50 is: 43,120.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,388.90 : 70,928.10 = 31,241.50 : x
  2. Step 2: Convert to fraction form
    51,388.90/70,928.10 = 31,241.50/x
  3. Step 3: Cross multiply
    51,388.90x = 70,928.10 × 31,241.50
  4. Step 4: Simplify right side
    51,388.90x = 2,215,900,236.15
  5. Step 5: Solve for x
    x = 2,215,900,236.15/51,388.90
  6. Step 6: Final answer
    x = 43,120.21

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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.