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Finding the Fourth Proportional to 12,865.74, 19,330.89 and 8,187.78

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Solution

The fourth proportional to 12,865.74, 19,330.89 and 8,187.78 is: 12,302.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,865.74 : 19,330.89 = 8,187.78 : x
  2. Step 2: Convert to fraction form
    12,865.74/19,330.89 = 8,187.78/x
  3. Step 3: Cross multiply
    12,865.74x = 19,330.89 × 8,187.78
  4. Step 4: Simplify right side
    12,865.74x = 158,277,074.52
  5. Step 5: Solve for x
    x = 158,277,074.52/12,865.74
  6. Step 6: Final answer
    x = 12,302.21

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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.