Home / 20,840.23-28,759.52-11,408.79

Finding the Fourth Proportional to 20,840.23, 28,759.52 and 11,408.79

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Solution

The fourth proportional to 20,840.23, 28,759.52 and 11,408.79 is: 15,744.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.23 : 28,759.52 = 11,408.79 : x
  2. Step 2: Convert to fraction form
    20,840.23/28,759.52 = 11,408.79/x
  3. Step 3: Cross multiply
    20,840.23x = 28,759.52 × 11,408.79
  4. Step 4: Simplify right side
    20,840.23x = 328,111,267.14
  5. Step 5: Solve for x
    x = 328,111,267.14/20,840.23
  6. Step 6: Final answer
    x = 15,744.13

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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.