Home / 21,006.24-28,989.12-12,936.84

Finding the Fourth Proportional to 21,006.24, 28,989.12 and 12,936.84

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Solution

The fourth proportional to 21,006.24, 28,989.12 and 12,936.84 is: 17,853.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.24 : 28,989.12 = 12,936.84 : x
  2. Step 2: Convert to fraction form
    21,006.24/28,989.12 = 12,936.84/x
  3. Step 3: Cross multiply
    21,006.24x = 28,989.12 × 12,936.84
  4. Step 4: Simplify right side
    21,006.24x = 375,027,607.18
  5. Step 5: Solve for x
    x = 375,027,607.18/21,006.24
  6. Step 6: Final answer
    x = 17,853.15

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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.