Home / 13,421.08-18,521.22-7,831

Finding the Fourth Proportional to 13,421.08, 18,521.22 and 7,831

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Solution

The fourth proportional to 13,421.08, 18,521.22 and 7,831 is: 10,806.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.08 : 18,521.22 = 7,831 : x
  2. Step 2: Convert to fraction form
    13,421.08/18,521.22 = 7,831/x
  3. Step 3: Cross multiply
    13,421.08x = 18,521.22 × 7,831
  4. Step 4: Simplify right side
    13,421.08x = 145,039,673.82
  5. Step 5: Solve for x
    x = 145,039,673.82/13,421.08
  6. Step 6: Final answer
    x = 10,806.86

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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.