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Finding the Fourth Proportional to 18,779.42, 25,923.98 and 12,409.98

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Solution

The fourth proportional to 18,779.42, 25,923.98 and 12,409.98 is: 17,131.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,779.42 : 25,923.98 = 12,409.98 : x
  2. Step 2: Convert to fraction form
    18,779.42/25,923.98 = 12,409.98/x
  3. Step 3: Cross multiply
    18,779.42x = 25,923.98 × 12,409.98
  4. Step 4: Simplify right side
    18,779.42x = 321,716,073.32
  5. Step 5: Solve for x
    x = 321,716,073.32/18,779.42
  6. Step 6: Final answer
    x = 17,131.31

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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.