Home / 28,357.12-39,132.16-15,781.60

Finding the Fourth Proportional to 28,357.12, 39,132.16 and 15,781.60

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Solution

The fourth proportional to 28,357.12, 39,132.16 and 15,781.60 is: 21,778.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,357.12 : 39,132.16 = 15,781.60 : x
  2. Step 2: Convert to fraction form
    28,357.12/39,132.16 = 15,781.60/x
  3. Step 3: Cross multiply
    28,357.12x = 39,132.16 × 15,781.60
  4. Step 4: Simplify right side
    28,357.12x = 617,568,096.26
  5. Step 5: Solve for x
    x = 617,568,096.26/28,357.12
  6. Step 6: Final answer
    x = 21,778.24

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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.