Home / 20,643.15-28,486.49-11,211.69

Finding the Fourth Proportional to 20,643.15, 28,486.49 and 11,211.69

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Solution

The fourth proportional to 20,643.15, 28,486.49 and 11,211.69 is: 15,471.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.15 : 28,486.49 = 11,211.69 : x
  2. Step 2: Convert to fraction form
    20,643.15/28,486.49 = 11,211.69/x
  3. Step 3: Cross multiply
    20,643.15x = 28,486.49 × 11,211.69
  4. Step 4: Simplify right side
    20,643.15x = 319,381,639.01
  5. Step 5: Solve for x
    x = 319,381,639.01/20,643.15
  6. Step 6: Final answer
    x = 15,471.56

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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.