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Finding the Fourth Proportional to 13,810.80, 19,012.20 and 12,480.32

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Solution

The fourth proportional to 13,810.80, 19,012.20 and 12,480.32 is: 17,180.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,810.80 : 19,012.20 = 12,480.32 : x
  2. Step 2: Convert to fraction form
    13,810.80/19,012.20 = 12,480.32/x
  3. Step 3: Cross multiply
    13,810.80x = 19,012.20 × 12,480.32
  4. Step 4: Simplify right side
    13,810.80x = 237,278,339.90
  5. Step 5: Solve for x
    x = 237,278,339.90/13,810.80
  6. Step 6: Final answer
    x = 17,180.64

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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.