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Finding the Fourth Proportional to 128,635.32, 177,529.88 and 74,189.61

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Solution

The fourth proportional to 128,635.32, 177,529.88 and 74,189.61 is: 102,389.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,635.32 : 177,529.88 = 74,189.61 : x
  2. Step 2: Convert to fraction form
    128,635.32/177,529.88 = 74,189.61/x
  3. Step 3: Cross multiply
    128,635.32x = 177,529.88 × 74,189.61
  4. Step 4: Simplify right side
    128,635.32x = 13,170,872,189.60
  5. Step 5: Solve for x
    x = 13,170,872,189.60/128,635.32
  6. Step 6: Final answer
    x = 102,389.24

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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.