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Finding the Fourth Proportional to 128,605.73, 177,432.12 and 74,879.37

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Solution

The fourth proportional to 128,605.73, 177,432.12 and 74,879.37 is: 103,308.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,605.73 : 177,432.12 = 74,879.37 : x
  2. Step 2: Convert to fraction form
    128,605.73/177,432.12 = 74,879.37/x
  3. Step 3: Cross multiply
    128,605.73x = 177,432.12 × 74,879.37
  4. Step 4: Simplify right side
    128,605.73x = 13,286,005,363.36
  5. Step 5: Solve for x
    x = 13,286,005,363.36/128,605.73
  6. Step 6: Final answer
    x = 103,308.04

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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.