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Finding the Fourth Proportional to 13,955.88, 20,939.60 and 5,641.80

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Solution

The fourth proportional to 13,955.88, 20,939.60 and 5,641.80 is: 8,465.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,955.88 : 20,939.60 = 5,641.80 : x
  2. Step 2: Convert to fraction form
    13,955.88/20,939.60 = 5,641.80/x
  3. Step 3: Cross multiply
    13,955.88x = 20,939.60 × 5,641.80
  4. Step 4: Simplify right side
    13,955.88x = 118,137,035.28
  5. Step 5: Solve for x
    x = 118,137,035.28/13,955.88
  6. Step 6: Final answer
    x = 8,465.04

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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.