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Finding the Fourth Proportional to 12,975.70, 19,447.55 and 8,815.70

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Solution

The fourth proportional to 12,975.70, 19,447.55 and 8,815.70 is: 13,212.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,975.70 : 19,447.55 = 8,815.70 : x
  2. Step 2: Convert to fraction form
    12,975.70/19,447.55 = 8,815.70/x
  3. Step 3: Cross multiply
    12,975.70x = 19,447.55 × 8,815.70
  4. Step 4: Simplify right side
    12,975.70x = 171,443,766.54
  5. Step 5: Solve for x
    x = 171,443,766.54/12,975.70
  6. Step 6: Final answer
    x = 13,212.68

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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.