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Finding the Fourth Proportional to 19,516.80, 29,296.80 and 12,129.60

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Solution

The fourth proportional to 19,516.80, 29,296.80 and 12,129.60 is: 18,207.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,516.80 : 29,296.80 = 12,129.60 : x
  2. Step 2: Convert to fraction form
    19,516.80/29,296.80 = 12,129.60/x
  3. Step 3: Cross multiply
    19,516.80x = 29,296.80 × 12,129.60
  4. Step 4: Simplify right side
    19,516.80x = 355,358,465.28
  5. Step 5: Solve for x
    x = 355,358,465.28/19,516.80
  6. Step 6: Final answer
    x = 18,207.82

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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.