Home / 100,401.21-138,556.67-55,688.25

Finding the Fourth Proportional to 100,401.21, 138,556.67 and 55,688.25

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Solution

The fourth proportional to 100,401.21, 138,556.67 and 55,688.25 is: 76,851.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,401.21 : 138,556.67 = 55,688.25 : x
  2. Step 2: Convert to fraction form
    100,401.21/138,556.67 = 55,688.25/x
  3. Step 3: Cross multiply
    100,401.21x = 138,556.67 × 55,688.25
  4. Step 4: Simplify right side
    100,401.21x = 7,715,978,199.69
  5. Step 5: Solve for x
    x = 7,715,978,199.69/100,401.21
  6. Step 6: Final answer
    x = 76,851.45

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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.