Home / 28,418.40-42,640.40-13,621.60

Finding the Fourth Proportional to 28,418.40, 42,640.40 and 13,621.60

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Solution

The fourth proportional to 28,418.40, 42,640.40 and 13,621.60 is: 20,438.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,418.40 : 42,640.40 = 13,621.60 : x
  2. Step 2: Convert to fraction form
    28,418.40/42,640.40 = 13,621.60/x
  3. Step 3: Cross multiply
    28,418.40x = 42,640.40 × 13,621.60
  4. Step 4: Simplify right side
    28,418.40x = 580,830,472.64
  5. Step 5: Solve for x
    x = 580,830,472.64/28,418.40
  6. Step 6: Final answer
    x = 20,438.54

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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.