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Finding the Fourth Proportional to 128,439.75, 177,129.78 and 110,284.78

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Solution

The fourth proportional to 128,439.75, 177,129.78 and 110,284.78 is: 152,092.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,439.75 : 177,129.78 = 110,284.78 : x
  2. Step 2: Convert to fraction form
    128,439.75/177,129.78 = 110,284.78/x
  3. Step 3: Cross multiply
    128,439.75x = 177,129.78 × 110,284.78
  4. Step 4: Simplify right side
    128,439.75x = 19,534,717,381.68
  5. Step 5: Solve for x
    x = 19,534,717,381.68/128,439.75
  6. Step 6: Final answer
    x = 152,092.46

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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.