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Finding the Fourth Proportional to 81,245.90, 121,880.40 and 25,090.58

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Solution

The fourth proportional to 81,245.90, 121,880.40 and 25,090.58 is: 37,639.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,245.90 : 121,880.40 = 25,090.58 : x
  2. Step 2: Convert to fraction form
    81,245.90/121,880.40 = 25,090.58/x
  3. Step 3: Cross multiply
    81,245.90x = 121,880.40 × 25,090.58
  4. Step 4: Simplify right side
    81,245.90x = 3,058,049,926.63
  5. Step 5: Solve for x
    x = 3,058,049,926.63/81,245.90
  6. Step 6: Final answer
    x = 37,639.44

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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.