Home / 15,512.09-21,406.79-8,438.57

Finding the Fourth Proportional to 15,512.09, 21,406.79 and 8,438.57

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Solution

The fourth proportional to 15,512.09, 21,406.79 and 8,438.57 is: 11,645.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,512.09 : 21,406.79 = 8,438.57 : x
  2. Step 2: Convert to fraction form
    15,512.09/21,406.79 = 8,438.57/x
  3. Step 3: Cross multiply
    15,512.09x = 21,406.79 × 8,438.57
  4. Step 4: Simplify right side
    15,512.09x = 180,642,695.89
  5. Step 5: Solve for x
    x = 180,642,695.89/15,512.09
  6. Step 6: Final answer
    x = 11,645.28

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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.