Home / 20,979.02-28,936.31-13,806.65

Finding the Fourth Proportional to 20,979.02, 28,936.31 and 13,806.65

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Solution

The fourth proportional to 20,979.02, 28,936.31 and 13,806.65 is: 19,043.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.02 : 28,936.31 = 13,806.65 : x
  2. Step 2: Convert to fraction form
    20,979.02/28,936.31 = 13,806.65/x
  3. Step 3: Cross multiply
    20,979.02x = 28,936.31 × 13,806.65
  4. Step 4: Simplify right side
    20,979.02x = 399,513,435.43
  5. Step 5: Solve for x
    x = 399,513,435.43/20,979.02
  6. Step 6: Final answer
    x = 19,043.47

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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.