Home / 20,515.10-28,296.74-12,561.23

Finding the Fourth Proportional to 20,515.10, 28,296.74 and 12,561.23

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Solution

The fourth proportional to 20,515.10, 28,296.74 and 12,561.23 is: 17,325.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.10 : 28,296.74 = 12,561.23 : x
  2. Step 2: Convert to fraction form
    20,515.10/28,296.74 = 12,561.23/x
  3. Step 3: Cross multiply
    20,515.10x = 28,296.74 × 12,561.23
  4. Step 4: Simplify right side
    20,515.10x = 355,441,655.10
  5. Step 5: Solve for x
    x = 355,441,655.10/20,515.10
  6. Step 6: Final answer
    x = 17,325.86

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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.