Home / 28,315.12-39,017.24-21,902.75

Finding the Fourth Proportional to 28,315.12, 39,017.24 and 21,902.75

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Solution

The fourth proportional to 28,315.12, 39,017.24 and 21,902.75 is: 30,181.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,315.12 : 39,017.24 = 21,902.75 : x
  2. Step 2: Convert to fraction form
    28,315.12/39,017.24 = 21,902.75/x
  3. Step 3: Cross multiply
    28,315.12x = 39,017.24 × 21,902.75
  4. Step 4: Simplify right side
    28,315.12x = 854,585,119.93
  5. Step 5: Solve for x
    x = 854,585,119.93/28,315.12
  6. Step 6: Final answer
    x = 30,181.23

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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.