Home / 21,315.30-31,982.16-11,443.05

Finding the Fourth Proportional to 21,315.30, 31,982.16 and 11,443.05

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Solution

The fourth proportional to 21,315.30, 31,982.16 and 11,443.05 is: 17,169.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.30 : 31,982.16 = 11,443.05 : x
  2. Step 2: Convert to fraction form
    21,315.30/31,982.16 = 11,443.05/x
  3. Step 3: Cross multiply
    21,315.30x = 31,982.16 × 11,443.05
  4. Step 4: Simplify right side
    21,315.30x = 365,973,455.99
  5. Step 5: Solve for x
    x = 365,973,455.99/21,315.30
  6. Step 6: Final answer
    x = 17,169.52

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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.