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Finding the Fourth Proportional to 128,861.70, 177,999.48 and 107,421.48

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Solution

The fourth proportional to 128,861.70, 177,999.48 and 107,421.48 is: 148,383.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,861.70 : 177,999.48 = 107,421.48 : x
  2. Step 2: Convert to fraction form
    128,861.70/177,999.48 = 107,421.48/x
  3. Step 3: Cross multiply
    128,861.70x = 177,999.48 × 107,421.48
  4. Step 4: Simplify right side
    128,861.70x = 19,120,967,580.83
  5. Step 5: Solve for x
    x = 19,120,967,580.83/128,861.70
  6. Step 6: Final answer
    x = 148,383.64

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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.