Home / 21,072.12-31,609.86-12,307.92

Finding the Fourth Proportional to 21,072.12, 31,609.86 and 12,307.92

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Solution

The fourth proportional to 21,072.12, 31,609.86 and 12,307.92 is: 18,462.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,072.12 : 31,609.86 = 12,307.92 : x
  2. Step 2: Convert to fraction form
    21,072.12/31,609.86 = 12,307.92/x
  3. Step 3: Cross multiply
    21,072.12x = 31,609.86 × 12,307.92
  4. Step 4: Simplify right side
    21,072.12x = 389,051,628.09
  5. Step 5: Solve for x
    x = 389,051,628.09/21,072.12
  6. Step 6: Final answer
    x = 18,462.86

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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.