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Finding the Fourth Proportional to 12,669.55, 18,989.73 and 6,813.86

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Solution

The fourth proportional to 12,669.55, 18,989.73 and 6,813.86 is: 10,212.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,669.55 : 18,989.73 = 6,813.86 : x
  2. Step 2: Convert to fraction form
    12,669.55/18,989.73 = 6,813.86/x
  3. Step 3: Cross multiply
    12,669.55x = 18,989.73 × 6,813.86
  4. Step 4: Simplify right side
    12,669.55x = 129,393,266.71
  5. Step 5: Solve for x
    x = 129,393,266.71/12,669.55
  6. Step 6: Final answer
    x = 10,212.94

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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.