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Finding the Fourth Proportional to 128,010.90, 176,453.78 and 87,654.80

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Solution

The fourth proportional to 128,010.90, 176,453.78 and 87,654.80 is: 120,825.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,010.90 : 176,453.78 = 87,654.80 : x
  2. Step 2: Convert to fraction form
    128,010.90/176,453.78 = 87,654.80/x
  3. Step 3: Cross multiply
    128,010.90x = 176,453.78 × 87,654.80
  4. Step 4: Simplify right side
    128,010.90x = 15,467,020,795.14
  5. Step 5: Solve for x
    x = 15,467,020,795.14/128,010.90
  6. Step 6: Final answer
    x = 120,825.81

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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.