Home / 128,395.13-177,185.88-71,806.50

Finding the Fourth Proportional to 128,395.13, 177,185.88 and 71,806.50

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Solution

The fourth proportional to 128,395.13, 177,185.88 and 71,806.50 is: 99,093.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,395.13 : 177,185.88 = 71,806.50 : x
  2. Step 2: Convert to fraction form
    128,395.13/177,185.88 = 71,806.50/x
  3. Step 3: Cross multiply
    128,395.13x = 177,185.88 × 71,806.50
  4. Step 4: Simplify right side
    128,395.13x = 12,723,097,892.22
  5. Step 5: Solve for x
    x = 12,723,097,892.22/128,395.13
  6. Step 6: Final answer
    x = 99,093.31

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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.