Home / 21,218.81-31,824.11-20,165.10

Finding the Fourth Proportional to 21,218.81, 31,824.11 and 20,165.10

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Solution

The fourth proportional to 21,218.81, 31,824.11 and 20,165.10 is: 30,243.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,218.81 : 31,824.11 = 20,165.10 : x
  2. Step 2: Convert to fraction form
    21,218.81/31,824.11 = 20,165.10/x
  3. Step 3: Cross multiply
    21,218.81x = 31,824.11 × 20,165.10
  4. Step 4: Simplify right side
    21,218.81x = 641,736,259.74
  5. Step 5: Solve for x
    x = 641,736,259.74/21,218.81
  6. Step 6: Final answer
    x = 30,243.75

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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.