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Finding the Fourth Proportional to 81,347.40, 122,041.10 and 28,040.20

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Solution

The fourth proportional to 81,347.40, 122,041.10 and 28,040.20 is: 42,067.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,347.40 : 122,041.10 = 28,040.20 : x
  2. Step 2: Convert to fraction form
    81,347.40/122,041.10 = 28,040.20/x
  3. Step 3: Cross multiply
    81,347.40x = 122,041.10 × 28,040.20
  4. Step 4: Simplify right side
    81,347.40x = 3,422,056,852.22
  5. Step 5: Solve for x
    x = 3,422,056,852.22/81,347.40
  6. Step 6: Final answer
    x = 42,067.19

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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.