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Finding the Fourth Proportional to 13,480,978.10, 20,221,467.15 and 12,790,104.80

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Solution

The fourth proportional to 13,480,978.10, 20,221,467.15 and 12,790,104.80 is: 19,185,157.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,480,978.10 : 20,221,467.15 = 12,790,104.80 : x
  2. Step 2: Convert to fraction form
    13,480,978.10/20,221,467.15 = 12,790,104.80/x
  3. Step 3: Cross multiply
    13,480,978.10x = 20,221,467.15 × 12,790,104.80
  4. Step 4: Simplify right side
    13,480,978.10x = 258,634,684,058,257.31
  5. Step 5: Solve for x
    x = 258,634,684,058,257.31/13,480,978.10
  6. Step 6: Final answer
    x = 19,185,157.20

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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.