Home / 21,991.23-30,347.19-12,431.48

Finding the Fourth Proportional to 21,991.23, 30,347.19 and 12,431.48

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Solution

The fourth proportional to 21,991.23, 30,347.19 and 12,431.48 is: 17,155.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.23 : 30,347.19 = 12,431.48 : x
  2. Step 2: Convert to fraction form
    21,991.23/30,347.19 = 12,431.48/x
  3. Step 3: Cross multiply
    21,991.23x = 30,347.19 × 12,431.48
  4. Step 4: Simplify right side
    21,991.23x = 377,260,333.81
  5. Step 5: Solve for x
    x = 377,260,333.81/21,991.23
  6. Step 6: Final answer
    x = 17,155.04

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1.5x scale

Why These Related Problems?

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