Home / 28,272.96-39,019.20-21,187.20

Finding the Fourth Proportional to 28,272.96, 39,019.20 and 21,187.20

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Solution

The fourth proportional to 28,272.96, 39,019.20 and 21,187.20 is: 29,240.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,272.96 : 39,019.20 = 21,187.20 : x
  2. Step 2: Convert to fraction form
    28,272.96/39,019.20 = 21,187.20/x
  3. Step 3: Cross multiply
    28,272.96x = 39,019.20 × 21,187.20
  4. Step 4: Simplify right side
    28,272.96x = 826,707,594.24
  5. Step 5: Solve for x
    x = 826,707,594.24/28,272.96
  6. Step 6: Final answer
    x = 29,240.22

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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.