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Finding the Fourth Proportional to 13,630.68, 18,809.28 and 7,661.18

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Solution

The fourth proportional to 13,630.68, 18,809.28 and 7,661.18 is: 10,571.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,630.68 : 18,809.28 = 7,661.18 : x
  2. Step 2: Convert to fraction form
    13,630.68/18,809.28 = 7,661.18/x
  3. Step 3: Cross multiply
    13,630.68x = 18,809.28 × 7,661.18
  4. Step 4: Simplify right side
    13,630.68x = 144,101,326.77
  5. Step 5: Solve for x
    x = 144,101,326.77/13,630.68
  6. Step 6: Final answer
    x = 10,571.84

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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.