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Finding the Fourth Proportional to 128,414.18, 177,255.30 and 74,744.29

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Solution

The fourth proportional to 128,414.18, 177,255.30 and 74,744.29 is: 103,172.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,414.18 : 177,255.30 = 74,744.29 : x
  2. Step 2: Convert to fraction form
    128,414.18/177,255.30 = 74,744.29/x
  3. Step 3: Cross multiply
    128,414.18x = 177,255.30 × 74,744.29
  4. Step 4: Simplify right side
    128,414.18x = 13,248,821,173.52
  5. Step 5: Solve for x
    x = 13,248,821,173.52/128,414.18
  6. Step 6: Final answer
    x = 103,172.57

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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.