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Finding the Fourth Proportional to 21,879.20, 32,823.60 and 7,085.60

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Solution

The fourth proportional to 21,879.20, 32,823.60 and 7,085.60 is: 10,629.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.20 : 32,823.60 = 7,085.60 : x
  2. Step 2: Convert to fraction form
    21,879.20/32,823.60 = 7,085.60/x
  3. Step 3: Cross multiply
    21,879.20x = 32,823.60 × 7,085.60
  4. Step 4: Simplify right side
    21,879.20x = 232,574,900.16
  5. Step 5: Solve for x
    x = 232,574,900.16/21,879.20
  6. Step 6: Final answer
    x = 10,629.95

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1.5x scale

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.