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Finding the Fourth Proportional to 128,639.78, 177,523.44 and 74,961.62

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Solution

The fourth proportional to 128,639.78, 177,523.44 and 74,961.62 is: 103,447.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,639.78 : 177,523.44 = 74,961.62 : x
  2. Step 2: Convert to fraction form
    128,639.78/177,523.44 = 74,961.62/x
  3. Step 3: Cross multiply
    128,639.78x = 177,523.44 × 74,961.62
  4. Step 4: Simplify right side
    128,639.78x = 13,307,444,650.37
  5. Step 5: Solve for x
    x = 13,307,444,650.37/128,639.78
  6. Step 6: Final answer
    x = 103,447.35

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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.