Home / 20,990.72-31,351.24-19,012.16

Finding the Fourth Proportional to 20,990.72, 31,351.24 and 19,012.16

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Solution

The fourth proportional to 20,990.72, 31,351.24 and 19,012.16 is: 28,396.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.72 : 31,351.24 = 19,012.16 : x
  2. Step 2: Convert to fraction form
    20,990.72/31,351.24 = 19,012.16/x
  3. Step 3: Cross multiply
    20,990.72x = 31,351.24 × 19,012.16
  4. Step 4: Simplify right side
    20,990.72x = 596,054,791.08
  5. Step 5: Solve for x
    x = 596,054,791.08/20,990.72
  6. Step 6: Final answer
    x = 28,396.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.