Home / 20,905.75-28,848.89-12,408.24

Finding the Fourth Proportional to 20,905.75, 28,848.89 and 12,408.24

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Solution

The fourth proportional to 20,905.75, 28,848.89 and 12,408.24 is: 17,122.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.75 : 28,848.89 = 12,408.24 : x
  2. Step 2: Convert to fraction form
    20,905.75/28,848.89 = 12,408.24/x
  3. Step 3: Cross multiply
    20,905.75x = 28,848.89 × 12,408.24
  4. Step 4: Simplify right side
    20,905.75x = 357,963,950.85
  5. Step 5: Solve for x
    x = 357,963,950.85/20,905.75
  6. Step 6: Final answer
    x = 17,122.75

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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.