Home / 20,643.12-28,486.62-11,211.48

Finding the Fourth Proportional to 20,643.12, 28,486.62 and 11,211.48

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Solution

The fourth proportional to 20,643.12, 28,486.62 and 11,211.48 is: 15,471.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.12 : 28,486.62 = 11,211.48 : x
  2. Step 2: Convert to fraction form
    20,643.12/28,486.62 = 11,211.48/x
  3. Step 3: Cross multiply
    20,643.12x = 28,486.62 × 11,211.48
  4. Step 4: Simplify right side
    20,643.12x = 319,377,170.40
  5. Step 5: Solve for x
    x = 319,377,170.40/20,643.12
  6. Step 6: Final answer
    x = 15,471.36

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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.