Home / 20,355.61-28,074.94-13,639.09

Finding the Fourth Proportional to 20,355.61, 28,074.94 and 13,639.09

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Solution

The fourth proportional to 20,355.61, 28,074.94 and 13,639.09 is: 18,811.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,355.61 : 28,074.94 = 13,639.09 : x
  2. Step 2: Convert to fraction form
    20,355.61/28,074.94 = 13,639.09/x
  3. Step 3: Cross multiply
    20,355.61x = 28,074.94 × 13,639.09
  4. Step 4: Simplify right side
    20,355.61x = 382,916,633.40
  5. Step 5: Solve for x
    x = 382,916,633.40/20,355.61
  6. Step 6: Final answer
    x = 18,811.36

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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.