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Finding the Fourth Proportional to 128,442.87, 177,286.82 and 74,738.30

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Solution

The fourth proportional to 128,442.87, 177,286.82 and 74,738.30 is: 103,159.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,442.87 : 177,286.82 = 74,738.30 : x
  2. Step 2: Convert to fraction form
    128,442.87/177,286.82 = 74,738.30/x
  3. Step 3: Cross multiply
    128,442.87x = 177,286.82 × 74,738.30
  4. Step 4: Simplify right side
    128,442.87x = 13,250,114,279.08
  5. Step 5: Solve for x
    x = 13,250,114,279.08/128,442.87
  6. Step 6: Final answer
    x = 103,159.59

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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.