Home / 20,378.78-28,124.55-11,880.24

Finding the Fourth Proportional to 20,378.78, 28,124.55 and 11,880.24

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Solution

The fourth proportional to 20,378.78, 28,124.55 and 11,880.24 is: 16,395.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.78 : 28,124.55 = 11,880.24 : x
  2. Step 2: Convert to fraction form
    20,378.78/28,124.55 = 11,880.24/x
  3. Step 3: Cross multiply
    20,378.78x = 28,124.55 × 11,880.24
  4. Step 4: Simplify right side
    20,378.78x = 334,126,403.89
  5. Step 5: Solve for x
    x = 334,126,403.89/20,378.78
  6. Step 6: Final answer
    x = 16,395.80

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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.