Home / 13,511.39-18,642.43-7,921.31

Finding the Fourth Proportional to 13,511.39, 18,642.43 and 7,921.31

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Solution

The fourth proportional to 13,511.39, 18,642.43 and 7,921.31 is: 10,929.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,511.39 : 18,642.43 = 7,921.31 : x
  2. Step 2: Convert to fraction form
    13,511.39/18,642.43 = 7,921.31/x
  3. Step 3: Cross multiply
    13,511.39x = 18,642.43 × 7,921.31
  4. Step 4: Simplify right side
    13,511.39x = 147,672,467.18
  5. Step 5: Solve for x
    x = 147,672,467.18/13,511.39
  6. Step 6: Final answer
    x = 10,929.48

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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.