Home / 81,023.16-121,359.78-79,040.28

Finding the Fourth Proportional to 81,023.16, 121,359.78 and 79,040.28

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Solution

The fourth proportional to 81,023.16, 121,359.78 and 79,040.28 is: 118,389.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,023.16 : 121,359.78 = 79,040.28 : x
  2. Step 2: Convert to fraction form
    81,023.16/121,359.78 = 79,040.28/x
  3. Step 3: Cross multiply
    81,023.16x = 121,359.78 × 79,040.28
  4. Step 4: Simplify right side
    81,023.16x = 9,592,310,991.94
  5. Step 5: Solve for x
    x = 9,592,310,991.94/81,023.16
  6. Step 6: Final answer
    x = 118,389.74

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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.