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Finding the Fourth Proportional to 128,554.85, 177,405.69 and 78,253.85

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Solution

The fourth proportional to 128,554.85, 177,405.69 and 78,253.85 is: 107,990.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,554.85 : 177,405.69 = 78,253.85 : x
  2. Step 2: Convert to fraction form
    128,554.85/177,405.69 = 78,253.85/x
  3. Step 3: Cross multiply
    128,554.85x = 177,405.69 × 78,253.85
  4. Step 4: Simplify right side
    128,554.85x = 13,882,676,976.11
  5. Step 5: Solve for x
    x = 13,882,676,976.11/128,554.85
  6. Step 6: Final answer
    x = 107,990.31

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1.5x scale

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.