Home / 30,129.90-41,580.34-18,190.92

Finding the Fourth Proportional to 30,129.90, 41,580.34 and 18,190.92

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Solution

The fourth proportional to 30,129.90, 41,580.34 and 18,190.92 is: 25,104.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,129.90 : 41,580.34 = 18,190.92 : x
  2. Step 2: Convert to fraction form
    30,129.90/41,580.34 = 18,190.92/x
  3. Step 3: Cross multiply
    30,129.90x = 41,580.34 × 18,190.92
  4. Step 4: Simplify right side
    30,129.90x = 756,384,638.51
  5. Step 5: Solve for x
    x = 756,384,638.51/30,129.90
  6. Step 6: Final answer
    x = 25,104.12

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Double scale
Find fourth proportional to 30,130.90, 41,581.72 and 18,191.92
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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.