Home / 20,975.78-31,474.67-13,578.32

Finding the Fourth Proportional to 20,975.78, 31,474.67 and 13,578.32

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Solution

The fourth proportional to 20,975.78, 31,474.67 and 13,578.32 is: 20,374.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,975.78 : 31,474.67 = 13,578.32 : x
  2. Step 2: Convert to fraction form
    20,975.78/31,474.67 = 13,578.32/x
  3. Step 3: Cross multiply
    20,975.78x = 31,474.67 × 13,578.32
  4. Step 4: Simplify right side
    20,975.78x = 427,372,915.89
  5. Step 5: Solve for x
    x = 427,372,915.89/20,975.78
  6. Step 6: Final answer
    x = 20,374.59

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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.