Home / 20,921.85-28,852.32-13,739.08

Finding the Fourth Proportional to 20,921.85, 28,852.32 and 13,739.08

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Solution

The fourth proportional to 20,921.85, 28,852.32 and 13,739.08 is: 18,946.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.85 : 28,852.32 = 13,739.08 : x
  2. Step 2: Convert to fraction form
    20,921.85/28,852.32 = 13,739.08/x
  3. Step 3: Cross multiply
    20,921.85x = 28,852.32 × 13,739.08
  4. Step 4: Simplify right side
    20,921.85x = 396,404,332.67
  5. Step 5: Solve for x
    x = 396,404,332.67/20,921.85
  6. Step 6: Final answer
    x = 18,946.91

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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.