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Finding the Fourth Proportional to 13,680, 18,878.40 and 7,392.38

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Solution

The fourth proportional to 13,680, 18,878.40 and 7,392.38 is: 10,201.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,680 : 18,878.40 = 7,392.38 : x
  2. Step 2: Convert to fraction form
    13,680/18,878.40 = 7,392.38/x
  3. Step 3: Cross multiply
    13,680x = 18,878.40 × 7,392.38
  4. Step 4: Simplify right side
    13,680x = 139,556,212.20
  5. Step 5: Solve for x
    x = 139,556,212.20/13,680
  6. Step 6: Final answer
    x = 10,201.48

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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.