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Finding the Fourth Proportional to 13,680.80, 20,488.80 and 9,274.40

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Solution

The fourth proportional to 13,680.80, 20,488.80 and 9,274.40 is: 13,889.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,680.80 : 20,488.80 = 9,274.40 : x
  2. Step 2: Convert to fraction form
    13,680.80/20,488.80 = 9,274.40/x
  3. Step 3: Cross multiply
    13,680.80x = 20,488.80 × 9,274.40
  4. Step 4: Simplify right side
    13,680.80x = 190,021,326.72
  5. Step 5: Solve for x
    x = 190,021,326.72/13,680.80
  6. Step 6: Final answer
    x = 13,889.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.