Home / 128,928.84-177,929.64-85,833.96

Finding the Fourth Proportional to 128,928.84, 177,929.64 and 85,833.96

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Solution

The fourth proportional to 128,928.84, 177,929.64 and 85,833.96 is: 118,456.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,928.84 : 177,929.64 = 85,833.96 : x
  2. Step 2: Convert to fraction form
    128,928.84/177,929.64 = 85,833.96/x
  3. Step 3: Cross multiply
    128,928.84x = 177,929.64 × 85,833.96
  4. Step 4: Simplify right side
    128,928.84x = 15,272,405,602.57
  5. Step 5: Solve for x
    x = 15,272,405,602.57/128,928.84
  6. Step 6: Final answer
    x = 118,456.08

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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.