Home / 21,129.20-29,158.20-12,178.40

Finding the Fourth Proportional to 21,129.20, 29,158.20 and 12,178.40

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Solution

The fourth proportional to 21,129.20, 29,158.20 and 12,178.40 is: 16,806.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.20 : 29,158.20 = 12,178.40 : x
  2. Step 2: Convert to fraction form
    21,129.20/29,158.20 = 12,178.40/x
  3. Step 3: Cross multiply
    21,129.20x = 29,158.20 × 12,178.40
  4. Step 4: Simplify right side
    21,129.20x = 355,100,222.88
  5. Step 5: Solve for x
    x = 355,100,222.88/21,129.20
  6. Step 6: Final answer
    x = 16,806.14

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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.