Home / 100,729.29-139,004.12-55,406.30

Finding the Fourth Proportional to 100,729.29, 139,004.12 and 55,406.30

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Solution

The fourth proportional to 100,729.29, 139,004.12 and 55,406.30 is: 76,459.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,729.29 : 139,004.12 = 55,406.30 : x
  2. Step 2: Convert to fraction form
    100,729.29/139,004.12 = 55,406.30/x
  3. Step 3: Cross multiply
    100,729.29x = 139,004.12 × 55,406.30
  4. Step 4: Simplify right side
    100,729.29x = 7,701,703,001.90
  5. Step 5: Solve for x
    x = 7,701,703,001.90/100,729.29
  6. Step 6: Final answer
    x = 76,459.42

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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.