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Finding the Fourth Proportional to 128,462.20, 177,313.50 and 74,757.64

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Solution

The fourth proportional to 128,462.20, 177,313.50 and 74,757.64 is: 103,186.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,462.20 : 177,313.50 = 74,757.64 : x
  2. Step 2: Convert to fraction form
    128,462.20/177,313.50 = 74,757.64/x
  3. Step 3: Cross multiply
    128,462.20x = 177,313.50 × 74,757.64
  4. Step 4: Simplify right side
    128,462.20x = 13,255,538,800.14
  5. Step 5: Solve for x
    x = 13,255,538,800.14/128,462.20
  6. Step 6: Final answer
    x = 103,186.30

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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.