Home / 20,376.81-28,125-12,423.42

Finding the Fourth Proportional to 20,376.81, 28,125 and 12,423.42

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Solution

The fourth proportional to 20,376.81, 28,125 and 12,423.42 is: 17,147.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,376.81 : 28,125 = 12,423.42 : x
  2. Step 2: Convert to fraction form
    20,376.81/28,125 = 12,423.42/x
  3. Step 3: Cross multiply
    20,376.81x = 28,125 × 12,423.42
  4. Step 4: Simplify right side
    20,376.81x = 349,408,687.50
  5. Step 5: Solve for x
    x = 349,408,687.50/20,376.81
  6. Step 6: Final answer
    x = 17,147.37

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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.