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Finding the Fourth Proportional to 128,260.72, 177,024.72 and 74,556.64

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Solution

The fourth proportional to 128,260.72, 177,024.72 and 74,556.64 is: 102,902.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,260.72 : 177,024.72 = 74,556.64 : x
  2. Step 2: Convert to fraction form
    128,260.72/177,024.72 = 74,556.64/x
  3. Step 3: Cross multiply
    128,260.72x = 177,024.72 × 74,556.64
  4. Step 4: Simplify right side
    128,260.72x = 13,198,368,320.14
  5. Step 5: Solve for x
    x = 13,198,368,320.14/128,260.72
  6. Step 6: Final answer
    x = 102,902.65

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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.