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Finding the Fourth Proportional to 13,605.13, 18,774.75 and 7,636.68

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Solution

The fourth proportional to 13,605.13, 18,774.75 and 7,636.68 is: 10,538.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,605.13 : 18,774.75 = 7,636.68 : x
  2. Step 2: Convert to fraction form
    13,605.13/18,774.75 = 7,636.68/x
  3. Step 3: Cross multiply
    13,605.13x = 18,774.75 × 7,636.68
  4. Step 4: Simplify right side
    13,605.13x = 143,376,786.47
  5. Step 5: Solve for x
    x = 143,376,786.47/13,605.13
  6. Step 6: Final answer
    x = 10,538.43

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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.