Home / 20,872.66-28,804.36-11,312.57

Finding the Fourth Proportional to 20,872.66, 28,804.36 and 11,312.57

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Solution

The fourth proportional to 20,872.66, 28,804.36 and 11,312.57 is: 15,611.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.66 : 28,804.36 = 11,312.57 : x
  2. Step 2: Convert to fraction form
    20,872.66/28,804.36 = 11,312.57/x
  3. Step 3: Cross multiply
    20,872.66x = 28,804.36 × 11,312.57
  4. Step 4: Simplify right side
    20,872.66x = 325,851,338.81
  5. Step 5: Solve for x
    x = 325,851,338.81/20,872.66
  6. Step 6: Final answer
    x = 15,611.39

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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.