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Finding the Fourth Proportional to 18,396.84, 25,388.18 and 13,028.88

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Solution

The fourth proportional to 18,396.84, 25,388.18 and 13,028.88 is: 17,980.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,396.84 : 25,388.18 = 13,028.88 : x
  2. Step 2: Convert to fraction form
    18,396.84/25,388.18 = 13,028.88/x
  3. Step 3: Cross multiply
    18,396.84x = 25,388.18 × 13,028.88
  4. Step 4: Simplify right side
    18,396.84x = 330,779,550.64
  5. Step 5: Solve for x
    x = 330,779,550.64/18,396.84
  6. Step 6: Final answer
    x = 17,980.24

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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.