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Finding the Fourth Proportional to 13,689.86, 20,534.82 and 4,455.86

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Solution

The fourth proportional to 13,689.86, 20,534.82 and 4,455.86 is: 6,683.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.86 : 20,534.82 = 4,455.86 : x
  2. Step 2: Convert to fraction form
    13,689.86/20,534.82 = 4,455.86/x
  3. Step 3: Cross multiply
    13,689.86x = 20,534.82 × 4,455.86
  4. Step 4: Simplify right side
    13,689.86x = 91,500,283.05
  5. Step 5: Solve for x
    x = 91,500,283.05/13,689.86
  6. Step 6: Final answer
    x = 6,683.80

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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.