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Finding the Fourth Proportional to 14,004.80, 21,007.20 and 13,620.80

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Solution

The fourth proportional to 14,004.80, 21,007.20 and 13,620.80 is: 20,431.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,004.80 : 21,007.20 = 13,620.80 : x
  2. Step 2: Convert to fraction form
    14,004.80/21,007.20 = 13,620.80/x
  3. Step 3: Cross multiply
    14,004.80x = 21,007.20 × 13,620.80
  4. Step 4: Simplify right side
    14,004.80x = 286,134,869.76
  5. Step 5: Solve for x
    x = 286,134,869.76/14,004.80
  6. Step 6: Final answer
    x = 20,431.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.