Home / 20,880.68-28,782.59-15,824.66

Finding the Fourth Proportional to 20,880.68, 28,782.59 and 15,824.66

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Solution

The fourth proportional to 20,880.68, 28,782.59 and 15,824.66 is: 21,813.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.68 : 28,782.59 = 15,824.66 : x
  2. Step 2: Convert to fraction form
    20,880.68/28,782.59 = 15,824.66/x
  3. Step 3: Cross multiply
    20,880.68x = 28,782.59 × 15,824.66
  4. Step 4: Simplify right side
    20,880.68x = 455,474,477.63
  5. Step 5: Solve for x
    x = 455,474,477.63/20,880.68
  6. Step 6: Final answer
    x = 21,813.21

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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.