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Finding the Fourth Proportional to 128,805.64, 177,734.34 and 74,359.72

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Solution

The fourth proportional to 128,805.64, 177,734.34 and 74,359.72 is: 102,606.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,805.64 : 177,734.34 = 74,359.72 : x
  2. Step 2: Convert to fraction form
    128,805.64/177,734.34 = 74,359.72/x
  3. Step 3: Cross multiply
    128,805.64x = 177,734.34 × 74,359.72
  4. Step 4: Simplify right side
    128,805.64x = 13,216,275,756.78
  5. Step 5: Solve for x
    x = 13,216,275,756.78/128,805.64
  6. Step 6: Final answer
    x = 102,606.34

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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.