Home / 28,320.09-39,080.64-15,745.65

Finding the Fourth Proportional to 28,320.09, 39,080.64 and 15,745.65

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Solution

The fourth proportional to 28,320.09, 39,080.64 and 15,745.65 is: 21,728.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,320.09 : 39,080.64 = 15,745.65 : x
  2. Step 2: Convert to fraction form
    28,320.09/39,080.64 = 15,745.65/x
  3. Step 3: Cross multiply
    28,320.09x = 39,080.64 × 15,745.65
  4. Step 4: Simplify right side
    28,320.09x = 615,350,079.22
  5. Step 5: Solve for x
    x = 615,350,079.22/28,320.09
  6. Step 6: Final answer
    x = 21,728.39

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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.