Home / 15,513.88-21,399.55-13,529.20

Finding the Fourth Proportional to 15,513.88, 21,399.55 and 13,529.20

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Solution

The fourth proportional to 15,513.88, 21,399.55 and 13,529.20 is: 18,661.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,513.88 : 21,399.55 = 13,529.20 : x
  2. Step 2: Convert to fraction form
    15,513.88/21,399.55 = 13,529.20/x
  3. Step 3: Cross multiply
    15,513.88x = 21,399.55 × 13,529.20
  4. Step 4: Simplify right side
    15,513.88x = 289,518,791.86
  5. Step 5: Solve for x
    x = 289,518,791.86/15,513.88
  6. Step 6: Final answer
    x = 18,661.92

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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.