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Finding the Fourth Proportional to 18,361.80, 25,339.44 and 9,978.30

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Solution

The fourth proportional to 18,361.80, 25,339.44 and 9,978.30 is: 13,770.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,361.80 : 25,339.44 = 9,978.30 : x
  2. Step 2: Convert to fraction form
    18,361.80/25,339.44 = 9,978.30/x
  3. Step 3: Cross multiply
    18,361.80x = 25,339.44 × 9,978.30
  4. Step 4: Simplify right side
    18,361.80x = 252,844,534.15
  5. Step 5: Solve for x
    x = 252,844,534.15/18,361.80
  6. Step 6: Final answer
    x = 13,770.14

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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.