Home / 15,408.40-21,268.20-9,821.20

Finding the Fourth Proportional to 15,408.40, 21,268.20 and 9,821.20

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Solution

The fourth proportional to 15,408.40, 21,268.20 and 9,821.20 is: 13,556.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,408.40 : 21,268.20 = 9,821.20 : x
  2. Step 2: Convert to fraction form
    15,408.40/21,268.20 = 9,821.20/x
  3. Step 3: Cross multiply
    15,408.40x = 21,268.20 × 9,821.20
  4. Step 4: Simplify right side
    15,408.40x = 208,879,245.84
  5. Step 5: Solve for x
    x = 208,879,245.84/15,408.40
  6. Step 6: Final answer
    x = 13,556.19

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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.