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Finding the Fourth Proportional to 19,209.40, 28,814.05 and 5,358.40

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Solution

The fourth proportional to 19,209.40, 28,814.05 and 5,358.40 is: 8,037.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,209.40 : 28,814.05 = 5,358.40 : x
  2. Step 2: Convert to fraction form
    19,209.40/28,814.05 = 5,358.40/x
  3. Step 3: Cross multiply
    19,209.40x = 28,814.05 × 5,358.40
  4. Step 4: Simplify right side
    19,209.40x = 154,397,205.52
  5. Step 5: Solve for x
    x = 154,397,205.52/19,209.40
  6. Step 6: Final answer
    x = 8,037.59

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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.