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Finding the Fourth Proportional to 128,750.50, 177,636.57 and 81,051.46

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Solution

The fourth proportional to 128,750.50, 177,636.57 and 81,051.46 is: 111,826.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,750.50 : 177,636.57 = 81,051.46 : x
  2. Step 2: Convert to fraction form
    128,750.50/177,636.57 = 81,051.46/x
  3. Step 3: Cross multiply
    128,750.50x = 177,636.57 × 81,051.46
  4. Step 4: Simplify right side
    128,750.50x = 14,397,703,347.89
  5. Step 5: Solve for x
    x = 14,397,703,347.89/128,750.50
  6. Step 6: Final answer
    x = 111,826.39

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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.