Home / 81,389.21-122,089.67-28,080.41

Finding the Fourth Proportional to 81,389.21, 122,089.67 and 28,080.41

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Solution

The fourth proportional to 81,389.21, 122,089.67 and 28,080.41 is: 42,122.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,389.21 : 122,089.67 = 28,080.41 : x
  2. Step 2: Convert to fraction form
    81,389.21/122,089.67 = 28,080.41/x
  3. Step 3: Cross multiply
    81,389.21x = 122,089.67 × 28,080.41
  4. Step 4: Simplify right side
    81,389.21x = 3,428,327,239.51
  5. Step 5: Solve for x
    x = 3,428,327,239.51/81,389.21
  6. Step 6: Final answer
    x = 42,122.63

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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.