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Finding the Fourth Proportional to 31,085.36, 42,879.40 and 22,000.48

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Solution

The fourth proportional to 31,085.36, 42,879.40 and 22,000.48 is: 30,347.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,085.36 : 42,879.40 = 22,000.48 : x
  2. Step 2: Convert to fraction form
    31,085.36/42,879.40 = 22,000.48/x
  3. Step 3: Cross multiply
    31,085.36x = 42,879.40 × 22,000.48
  4. Step 4: Simplify right side
    31,085.36x = 943,367,382.11
  5. Step 5: Solve for x
    x = 943,367,382.11/31,085.36
  6. Step 6: Final answer
    x = 30,347.64

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.