Home / 20,639.81-28,485.37-12,256.31

Finding the Fourth Proportional to 20,639.81, 28,485.37 and 12,256.31

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Solution

The fourth proportional to 20,639.81, 28,485.37 and 12,256.31 is: 16,915.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.81 : 28,485.37 = 12,256.31 : x
  2. Step 2: Convert to fraction form
    20,639.81/28,485.37 = 12,256.31/x
  3. Step 3: Cross multiply
    20,639.81x = 28,485.37 × 12,256.31
  4. Step 4: Simplify right side
    20,639.81x = 349,125,611.72
  5. Step 5: Solve for x
    x = 349,125,611.72/20,639.81
  6. Step 6: Final answer
    x = 16,915.15

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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.