Home / 12,728.10-19,128.60-11,124.30

Finding the Fourth Proportional to 12,728.10, 19,128.60 and 11,124.30

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Solution

The fourth proportional to 12,728.10, 19,128.60 and 11,124.30 is: 16,718.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,728.10 : 19,128.60 = 11,124.30 : x
  2. Step 2: Convert to fraction form
    12,728.10/19,128.60 = 11,124.30/x
  3. Step 3: Cross multiply
    12,728.10x = 19,128.60 × 11,124.30
  4. Step 4: Simplify right side
    12,728.10x = 212,792,284.98
  5. Step 5: Solve for x
    x = 212,792,284.98/12,728.10
  6. Step 6: Final answer
    x = 16,718.31

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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.