Home / 100,133.18-138,183.80-55,421.18

Finding the Fourth Proportional to 100,133.18, 138,183.80 and 55,421.18

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Solution

The fourth proportional to 100,133.18, 138,183.80 and 55,421.18 is: 76,481.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,133.18 : 138,183.80 = 55,421.18 : x
  2. Step 2: Convert to fraction form
    100,133.18/138,183.80 = 55,421.18/x
  3. Step 3: Cross multiply
    100,133.18x = 138,183.80 × 55,421.18
  4. Step 4: Simplify right side
    100,133.18x = 7,658,309,252.88
  5. Step 5: Solve for x
    x = 7,658,309,252.88/100,133.18
  6. Step 6: Final answer
    x = 76,481.23

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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.