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Finding the Fourth Proportional to 128,625.56, 177,532.80 and 85,606.89

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Solution

The fourth proportional to 128,625.56, 177,532.80 and 85,606.89 is: 118,157.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,625.56 : 177,532.80 = 85,606.89 : x
  2. Step 2: Convert to fraction form
    128,625.56/177,532.80 = 85,606.89/x
  3. Step 3: Cross multiply
    128,625.56x = 177,532.80 × 85,606.89
  4. Step 4: Simplify right side
    128,625.56x = 15,198,030,505.03
  5. Step 5: Solve for x
    x = 15,198,030,505.03/128,625.56
  6. Step 6: Final answer
    x = 118,157.16

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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.