Home / 15,309.99-21,140.24-12,477.78

Finding the Fourth Proportional to 15,309.99, 21,140.24 and 12,477.78

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Solution

The fourth proportional to 15,309.99, 21,140.24 and 12,477.78 is: 17,229.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,309.99 : 21,140.24 = 12,477.78 : x
  2. Step 2: Convert to fraction form
    15,309.99/21,140.24 = 12,477.78/x
  3. Step 3: Cross multiply
    15,309.99x = 21,140.24 × 12,477.78
  4. Step 4: Simplify right side
    15,309.99x = 263,783,201.48
  5. Step 5: Solve for x
    x = 263,783,201.48/15,309.99
  6. Step 6: Final answer
    x = 17,229.48

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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.