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Finding the Fourth Proportional to 13,681.52, 18,879.82 and 7,713.16

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Solution

The fourth proportional to 13,681.52, 18,879.82 and 7,713.16 is: 10,643.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,681.52 : 18,879.82 = 7,713.16 : x
  2. Step 2: Convert to fraction form
    13,681.52/18,879.82 = 7,713.16/x
  3. Step 3: Cross multiply
    13,681.52x = 18,879.82 × 7,713.16
  4. Step 4: Simplify right side
    13,681.52x = 145,623,072.43
  5. Step 5: Solve for x
    x = 145,623,072.43/13,681.52
  6. Step 6: Final answer
    x = 10,643.78

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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.