Home / 128,921.31-177,914.48-72,336.87

Finding the Fourth Proportional to 128,921.31, 177,914.48 and 72,336.87

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Solution

The fourth proportional to 128,921.31, 177,914.48 and 72,336.87 is: 99,826.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,921.31 : 177,914.48 = 72,336.87 : x
  2. Step 2: Convert to fraction form
    128,921.31/177,914.48 = 72,336.87/x
  3. Step 3: Cross multiply
    128,921.31x = 177,914.48 × 72,336.87
  4. Step 4: Simplify right side
    128,921.31x = 12,869,776,249.19
  5. Step 5: Solve for x
    x = 12,869,776,249.19/128,921.31
  6. Step 6: Final answer
    x = 99,826.60

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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.