Home / 13,385.39-18,471.34-7,720.37

Finding the Fourth Proportional to 13,385.39, 18,471.34 and 7,720.37

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Solution

The fourth proportional to 13,385.39, 18,471.34 and 7,720.37 is: 10,653.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,385.39 : 18,471.34 = 7,720.37 : x
  2. Step 2: Convert to fraction form
    13,385.39/18,471.34 = 7,720.37/x
  3. Step 3: Cross multiply
    13,385.39x = 18,471.34 × 7,720.37
  4. Step 4: Simplify right side
    13,385.39x = 142,605,579.20
  5. Step 5: Solve for x
    x = 142,605,579.20/13,385.39
  6. Step 6: Final answer
    x = 10,653.82

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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.