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Finding the Fourth Proportional to 13,953.90, 20,936.62 and 5,639.78

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Solution

The fourth proportional to 13,953.90, 20,936.62 and 5,639.78 is: 8,462.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,953.90 : 20,936.62 = 5,639.78 : x
  2. Step 2: Convert to fraction form
    13,953.90/20,936.62 = 5,639.78/x
  3. Step 3: Cross multiply
    13,953.90x = 20,936.62 × 5,639.78
  4. Step 4: Simplify right side
    13,953.90x = 118,077,930.74
  5. Step 5: Solve for x
    x = 118,077,930.74/13,953.90
  6. Step 6: Final answer
    x = 8,462.00

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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.