Home / 20,669.12-28,520.80-13,969.32

Finding the Fourth Proportional to 20,669.12, 28,520.80 and 13,969.32

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Solution

The fourth proportional to 20,669.12, 28,520.80 and 13,969.32 is: 19,275.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,669.12 : 28,520.80 = 13,969.32 : x
  2. Step 2: Convert to fraction form
    20,669.12/28,520.80 = 13,969.32/x
  3. Step 3: Cross multiply
    20,669.12x = 28,520.80 × 13,969.32
  4. Step 4: Simplify right side
    20,669.12x = 398,416,181.86
  5. Step 5: Solve for x
    x = 398,416,181.86/20,669.12
  6. Step 6: Final answer
    x = 19,275.91

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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.