Home / 20,868.96-31,314-9,190.32

Finding the Fourth Proportional to 20,868.96, 31,314 and 9,190.32

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Solution

The fourth proportional to 20,868.96, 31,314 and 9,190.32 is: 13,790.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.96 : 31,314 = 9,190.32 : x
  2. Step 2: Convert to fraction form
    20,868.96/31,314 = 9,190.32/x
  3. Step 3: Cross multiply
    20,868.96x = 31,314 × 9,190.32
  4. Step 4: Simplify right side
    20,868.96x = 287,785,680.48
  5. Step 5: Solve for x
    x = 287,785,680.48/20,868.96
  6. Step 6: Final answer
    x = 13,790.13

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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.