Home / 20,621.77-28,458.11-11,190.33

Finding the Fourth Proportional to 20,621.77, 28,458.11 and 11,190.33

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Solution

The fourth proportional to 20,621.77, 28,458.11 and 11,190.33 is: 15,442.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,621.77 : 28,458.11 = 11,190.33 : x
  2. Step 2: Convert to fraction form
    20,621.77/28,458.11 = 11,190.33/x
  3. Step 3: Cross multiply
    20,621.77x = 28,458.11 × 11,190.33
  4. Step 4: Simplify right side
    20,621.77x = 318,455,670.05
  5. Step 5: Solve for x
    x = 318,455,670.05/20,621.77
  6. Step 6: Final answer
    x = 15,442.70

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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.