Home / 18,712.80-25,788-13,398.36

Finding the Fourth Proportional to 18,712.80, 25,788 and 13,398.36

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Solution

The fourth proportional to 18,712.80, 25,788 and 13,398.36 is: 18,464.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.80 : 25,788 = 13,398.36 : x
  2. Step 2: Convert to fraction form
    18,712.80/25,788 = 13,398.36/x
  3. Step 3: Cross multiply
    18,712.80x = 25,788 × 13,398.36
  4. Step 4: Simplify right side
    18,712.80x = 345,516,907.68
  5. Step 5: Solve for x
    x = 345,516,907.68/18,712.80
  6. Step 6: Final answer
    x = 18,464.20

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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.