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Finding the Fourth Proportional to 13,913.40, 20,918.70 and 13,621.80

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Solution

The fourth proportional to 13,913.40, 20,918.70 and 13,621.80 is: 20,480.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,913.40 : 20,918.70 = 13,621.80 : x
  2. Step 2: Convert to fraction form
    13,913.40/20,918.70 = 13,621.80/x
  3. Step 3: Cross multiply
    13,913.40x = 20,918.70 × 13,621.80
  4. Step 4: Simplify right side
    13,913.40x = 284,950,347.66
  5. Step 5: Solve for x
    x = 284,950,347.66/13,913.40
  6. Step 6: Final answer
    x = 20,480.28

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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.