Home / 13,887.39-20,825.47-5,120.35

Finding the Fourth Proportional to 13,887.39, 20,825.47 and 5,120.35

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Solution

The fourth proportional to 13,887.39, 20,825.47 and 5,120.35 is: 7,678.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,887.39 : 20,825.47 = 5,120.35 : x
  2. Step 2: Convert to fraction form
    13,887.39/20,825.47 = 5,120.35/x
  3. Step 3: Cross multiply
    13,887.39x = 20,825.47 × 5,120.35
  4. Step 4: Simplify right side
    13,887.39x = 106,633,695.31
  5. Step 5: Solve for x
    x = 106,633,695.31/13,887.39
  6. Step 6: Final answer
    x = 7,678.45

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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.