Home / 21,168.20-29,215.14-12,215.72

Finding the Fourth Proportional to 21,168.20, 29,215.14 and 12,215.72

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Solution

The fourth proportional to 21,168.20, 29,215.14 and 12,215.72 is: 16,859.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,168.20 : 29,215.14 = 12,215.72 : x
  2. Step 2: Convert to fraction form
    21,168.20/29,215.14 = 12,215.72/x
  3. Step 3: Cross multiply
    21,168.20x = 29,215.14 × 12,215.72
  4. Step 4: Simplify right side
    21,168.20x = 356,883,970.00
  5. Step 5: Solve for x
    x = 356,883,970.00/21,168.20
  6. Step 6: Final answer
    x = 16,859.44

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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.