Home / 21,240.23-31,798.78-18,988.97

Finding the Fourth Proportional to 21,240.23, 31,798.78 and 18,988.97

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Solution

The fourth proportional to 21,240.23, 31,798.78 and 18,988.97 is: 28,428.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,240.23 : 31,798.78 = 18,988.97 : x
  2. Step 2: Convert to fraction form
    21,240.23/31,798.78 = 18,988.97/x
  3. Step 3: Cross multiply
    21,240.23x = 31,798.78 × 18,988.97
  4. Step 4: Simplify right side
    21,240.23x = 603,825,872.99
  5. Step 5: Solve for x
    x = 603,825,872.99/21,240.23
  6. Step 6: Final answer
    x = 28,428.41

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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.