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Finding the Fourth Proportional to 13,720.51, 18,934.68 and 7,752.06

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Solution

The fourth proportional to 13,720.51, 18,934.68 and 7,752.06 is: 10,698.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.51 : 18,934.68 = 7,752.06 : x
  2. Step 2: Convert to fraction form
    13,720.51/18,934.68 = 7,752.06/x
  3. Step 3: Cross multiply
    13,720.51x = 18,934.68 × 7,752.06
  4. Step 4: Simplify right side
    13,720.51x = 146,782,775.44
  5. Step 5: Solve for x
    x = 146,782,775.44/13,720.51
  6. Step 6: Final answer
    x = 10,698.06

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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.