Home / 21,430.10-32,120.30-12,672.38

Finding the Fourth Proportional to 21,430.10, 32,120.30 and 12,672.38

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Solution

The fourth proportional to 21,430.10, 32,120.30 and 12,672.38 is: 18,993.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,430.10 : 32,120.30 = 12,672.38 : x
  2. Step 2: Convert to fraction form
    21,430.10/32,120.30 = 12,672.38/x
  3. Step 3: Cross multiply
    21,430.10x = 32,120.30 × 12,672.38
  4. Step 4: Simplify right side
    21,430.10x = 407,040,647.31
  5. Step 5: Solve for x
    x = 407,040,647.31/21,430.10
  6. Step 6: Final answer
    x = 18,993.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.