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Finding the Fourth Proportional to 13,720.65, 18,934.50 and 8,054.28

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Solution

The fourth proportional to 13,720.65, 18,934.50 and 8,054.28 is: 11,114.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.65 : 18,934.50 = 8,054.28 : x
  2. Step 2: Convert to fraction form
    13,720.65/18,934.50 = 8,054.28/x
  3. Step 3: Cross multiply
    13,720.65x = 18,934.50 × 8,054.28
  4. Step 4: Simplify right side
    13,720.65x = 152,503,764.66
  5. Step 5: Solve for x
    x = 152,503,764.66/13,720.65
  6. Step 6: Final answer
    x = 11,114.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.