Home / 13,540.43-18,687.81-7,878.53

Finding the Fourth Proportional to 13,540.43, 18,687.81 and 7,878.53

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Solution

The fourth proportional to 13,540.43, 18,687.81 and 7,878.53 is: 10,873.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,540.43 : 18,687.81 = 7,878.53 : x
  2. Step 2: Convert to fraction form
    13,540.43/18,687.81 = 7,878.53/x
  3. Step 3: Cross multiply
    13,540.43x = 18,687.81 × 7,878.53
  4. Step 4: Simplify right side
    13,540.43x = 147,232,547.98
  5. Step 5: Solve for x
    x = 147,232,547.98/13,540.43
  6. Step 6: Final answer
    x = 10,873.55

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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.