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Finding the Fourth Proportional to 13,603.90, 18,772.09 and 7,634.40

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Solution

The fourth proportional to 13,603.90, 18,772.09 and 7,634.40 is: 10,534.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,603.90 : 18,772.09 = 7,634.40 : x
  2. Step 2: Convert to fraction form
    13,603.90/18,772.09 = 7,634.40/x
  3. Step 3: Cross multiply
    13,603.90x = 18,772.09 × 7,634.40
  4. Step 4: Simplify right side
    13,603.90x = 143,313,605.72
  5. Step 5: Solve for x
    x = 143,313,605.72/13,603.90
  6. Step 6: Final answer
    x = 10,534.75

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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.