Home / 20,423.94-28,120.50-18,555.36

Finding the Fourth Proportional to 20,423.94, 28,120.50 and 18,555.36

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Solution

The fourth proportional to 20,423.94, 28,120.50 and 18,555.36 is: 25,547.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,423.94 : 28,120.50 = 18,555.36 : x
  2. Step 2: Convert to fraction form
    20,423.94/28,120.50 = 18,555.36/x
  3. Step 3: Cross multiply
    20,423.94x = 28,120.50 × 18,555.36
  4. Step 4: Simplify right side
    20,423.94x = 521,786,000.88
  5. Step 5: Solve for x
    x = 521,786,000.88/20,423.94
  6. Step 6: Final answer
    x = 25,547.76

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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.