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Finding the Fourth Proportional to 13,515.68, 18,630.47 and 12,429.47

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Solution

The fourth proportional to 13,515.68, 18,630.47 and 12,429.47 is: 17,133.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,515.68 : 18,630.47 = 12,429.47 : x
  2. Step 2: Convert to fraction form
    13,515.68/18,630.47 = 12,429.47/x
  3. Step 3: Cross multiply
    13,515.68x = 18,630.47 × 12,429.47
  4. Step 4: Simplify right side
    13,515.68x = 231,566,945.60
  5. Step 5: Solve for x
    x = 231,566,945.60/13,515.68
  6. Step 6: Final answer
    x = 17,133.20

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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.