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Finding the Fourth Proportional to 128,405.69, 177,213.11 and 73,959.67

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Solution

The fourth proportional to 128,405.69, 177,213.11 and 73,959.67 is: 102,071.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,405.69 : 177,213.11 = 73,959.67 : x
  2. Step 2: Convert to fraction form
    128,405.69/177,213.11 = 73,959.67/x
  3. Step 3: Cross multiply
    128,405.69x = 177,213.11 × 73,959.67
  4. Step 4: Simplify right side
    128,405.69x = 13,106,623,135.27
  5. Step 5: Solve for x
    x = 13,106,623,135.27/128,405.69
  6. Step 6: Final answer
    x = 102,071.98

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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.