Home / 21,168.87-29,212.80-12,216.18

Finding the Fourth Proportional to 21,168.87, 29,212.80 and 12,216.18

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Solution

The fourth proportional to 21,168.87, 29,212.80 and 12,216.18 is: 16,858.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,168.87 : 29,212.80 = 12,216.18 : x
  2. Step 2: Convert to fraction form
    21,168.87/29,212.80 = 12,216.18/x
  3. Step 3: Cross multiply
    21,168.87x = 29,212.80 × 12,216.18
  4. Step 4: Simplify right side
    21,168.87x = 356,868,978.46
  5. Step 5: Solve for x
    x = 356,868,978.46/21,168.87
  6. Step 6: Final answer
    x = 16,858.19

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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.