Home / 13,142.82-18,137.46-7,478.37

Finding the Fourth Proportional to 13,142.82, 18,137.46 and 7,478.37

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Solution

The fourth proportional to 13,142.82, 18,137.46 and 7,478.37 is: 10,320.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,142.82 : 18,137.46 = 7,478.37 : x
  2. Step 2: Convert to fraction form
    13,142.82/18,137.46 = 7,478.37/x
  3. Step 3: Cross multiply
    13,142.82x = 18,137.46 × 7,478.37
  4. Step 4: Simplify right side
    13,142.82x = 135,638,636.74
  5. Step 5: Solve for x
    x = 135,638,636.74/13,142.82
  6. Step 6: Final answer
    x = 10,320.36

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Half scale
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Double scale
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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.