Home / 21,315.80-31,982.90-11,443.54

Finding the Fourth Proportional to 21,315.80, 31,982.90 and 11,443.54

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Solution

The fourth proportional to 21,315.80, 31,982.90 and 11,443.54 is: 17,170.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.80 : 31,982.90 = 11,443.54 : x
  2. Step 2: Convert to fraction form
    21,315.80/31,982.90 = 11,443.54/x
  3. Step 3: Cross multiply
    21,315.80x = 31,982.90 × 11,443.54
  4. Step 4: Simplify right side
    21,315.80x = 365,997,595.47
  5. Step 5: Solve for x
    x = 365,997,595.47/21,315.80
  6. Step 6: Final answer
    x = 17,170.25

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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.