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Finding the Fourth Proportional to 14,139.60, 21,209.40 and 12,584.40

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Solution

The fourth proportional to 14,139.60, 21,209.40 and 12,584.40 is: 18,876.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,139.60 : 21,209.40 = 12,584.40 : x
  2. Step 2: Convert to fraction form
    14,139.60/21,209.40 = 12,584.40/x
  3. Step 3: Cross multiply
    14,139.60x = 21,209.40 × 12,584.40
  4. Step 4: Simplify right side
    14,139.60x = 266,907,573.36
  5. Step 5: Solve for x
    x = 266,907,573.36/14,139.60
  6. Step 6: Final answer
    x = 18,876.60

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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.