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Finding the Fourth Proportional to 19,215.80, 28,814.10 and 8,815.80

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Solution

The fourth proportional to 19,215.80, 28,814.10 and 8,815.80 is: 13,219.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,215.80 : 28,814.10 = 8,815.80 : x
  2. Step 2: Convert to fraction form
    19,215.80/28,814.10 = 8,815.80/x
  3. Step 3: Cross multiply
    19,215.80x = 28,814.10 × 8,815.80
  4. Step 4: Simplify right side
    19,215.80x = 254,019,342.78
  5. Step 5: Solve for x
    x = 254,019,342.78/19,215.80
  6. Step 6: Final answer
    x = 13,219.30

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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.