Home / 128,974.86-177,993.24-72,386.28

Finding the Fourth Proportional to 128,974.86, 177,993.24 and 72,386.28

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Solution

The fourth proportional to 128,974.86, 177,993.24 and 72,386.28 is: 99,897.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,974.86 : 177,993.24 = 72,386.28 : x
  2. Step 2: Convert to fraction form
    128,974.86/177,993.24 = 72,386.28/x
  3. Step 3: Cross multiply
    128,974.86x = 177,993.24 × 72,386.28
  4. Step 4: Simplify right side
    128,974.86x = 12,884,268,508.75
  5. Step 5: Solve for x
    x = 12,884,268,508.75/128,974.86
  6. Step 6: Final answer
    x = 99,897.52

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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.