Home / 18,388.28-25,387.86-12,740.36

Finding the Fourth Proportional to 18,388.28, 25,387.86 and 12,740.36

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Solution

The fourth proportional to 18,388.28, 25,387.86 and 12,740.36 is: 17,590.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,388.28 : 25,387.86 = 12,740.36 : x
  2. Step 2: Convert to fraction form
    18,388.28/25,387.86 = 12,740.36/x
  3. Step 3: Cross multiply
    18,388.28x = 25,387.86 × 12,740.36
  4. Step 4: Simplify right side
    18,388.28x = 323,450,476.03
  5. Step 5: Solve for x
    x = 323,450,476.03/18,388.28
  6. Step 6: Final answer
    x = 17,590.03

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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.