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Finding the Fourth Proportional to 128,421.30, 177,234.72 and 73,975.34

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Solution

The fourth proportional to 128,421.30, 177,234.72 and 73,975.34 is: 102,093.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,421.30 : 177,234.72 = 73,975.34 : x
  2. Step 2: Convert to fraction form
    128,421.30/177,234.72 = 73,975.34/x
  3. Step 3: Cross multiply
    128,421.30x = 177,234.72 × 73,975.34
  4. Step 4: Simplify right side
    128,421.30x = 13,110,998,671.80
  5. Step 5: Solve for x
    x = 13,110,998,671.80/128,421.30
  6. Step 6: Final answer
    x = 102,093.65

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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.