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Finding the Fourth Proportional to 21,169.98, 29,207.93 and 12,216.31

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Solution

The fourth proportional to 21,169.98, 29,207.93 and 12,216.31 is: 16,854.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,169.98 : 29,207.93 = 12,216.31 : x
  2. Step 2: Convert to fraction form
    21,169.98/29,207.93 = 12,216.31/x
  3. Step 3: Cross multiply
    21,169.98x = 29,207.93 × 12,216.31
  4. Step 4: Simplify right side
    21,169.98x = 356,812,993.24
  5. Step 5: Solve for x
    x = 356,812,993.24/21,169.98
  6. Step 6: Final answer
    x = 16,854.67

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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.