Home / 20,291.24-30,421.20-12,880.28

Finding the Fourth Proportional to 20,291.24, 30,421.20 and 12,880.28

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Solution

The fourth proportional to 20,291.24, 30,421.20 and 12,880.28 is: 19,310.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,291.24 : 30,421.20 = 12,880.28 : x
  2. Step 2: Convert to fraction form
    20,291.24/30,421.20 = 12,880.28/x
  3. Step 3: Cross multiply
    20,291.24x = 30,421.20 × 12,880.28
  4. Step 4: Simplify right side
    20,291.24x = 391,833,573.94
  5. Step 5: Solve for x
    x = 391,833,573.94/20,291.24
  6. Step 6: Final answer
    x = 19,310.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.