Home / 21,143.67-29,216.75-20,118.81

Finding the Fourth Proportional to 21,143.67, 29,216.75 and 20,118.81

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Solution

The fourth proportional to 21,143.67, 29,216.75 and 20,118.81 is: 27,800.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,143.67 : 29,216.75 = 20,118.81 : x
  2. Step 2: Convert to fraction form
    21,143.67/29,216.75 = 20,118.81/x
  3. Step 3: Cross multiply
    21,143.67x = 29,216.75 × 20,118.81
  4. Step 4: Simplify right side
    21,143.67x = 587,806,364.20
  5. Step 5: Solve for x
    x = 587,806,364.20/21,143.67
  6. Step 6: Final answer
    x = 27,800.59

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1.5x scale

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.