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Finding the Fourth Proportional to 12,658.70, 18,988.36 and 3,893.68

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Solution

The fourth proportional to 12,658.70, 18,988.36 and 3,893.68 is: 5,840.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,658.70 : 18,988.36 = 3,893.68 : x
  2. Step 2: Convert to fraction form
    12,658.70/18,988.36 = 3,893.68/x
  3. Step 3: Cross multiply
    12,658.70x = 18,988.36 × 3,893.68
  4. Step 4: Simplify right side
    12,658.70x = 73,934,597.56
  5. Step 5: Solve for x
    x = 73,934,597.56/12,658.70
  6. Step 6: Final answer
    x = 5,840.62

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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.