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Finding the Fourth Proportional to 20,993.72, 28,973.38 and 15,679.31

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Solution

The fourth proportional to 20,993.72, 28,973.38 and 15,679.31 is: 21,638.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.72 : 28,973.38 = 15,679.31 : x
  2. Step 2: Convert to fraction form
    20,993.72/28,973.38 = 15,679.31/x
  3. Step 3: Cross multiply
    20,993.72x = 28,973.38 × 15,679.31
  4. Step 4: Simplify right side
    20,993.72x = 454,282,718.40
  5. Step 5: Solve for x
    x = 454,282,718.40/20,993.72
  6. Step 6: Final answer
    x = 21,638.98

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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.