Home / 20,636.64-28,485.36-12,138.66

Finding the Fourth Proportional to 20,636.64, 28,485.36 and 12,138.66

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Solution

The fourth proportional to 20,636.64, 28,485.36 and 12,138.66 is: 16,755.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636.64 : 28,485.36 = 12,138.66 : x
  2. Step 2: Convert to fraction form
    20,636.64/28,485.36 = 12,138.66/x
  3. Step 3: Cross multiply
    20,636.64x = 28,485.36 × 12,138.66
  4. Step 4: Simplify right side
    20,636.64x = 345,774,100.02
  5. Step 5: Solve for x
    x = 345,774,100.02/20,636.64
  6. Step 6: Final answer
    x = 16,755.35

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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.