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Finding the Fourth Proportional to 235,712.16, 325,276.51 and 128,279.88

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Solution

The fourth proportional to 235,712.16, 325,276.51 and 128,279.88 is: 177,022.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    235,712.16 : 325,276.51 = 128,279.88 : x
  2. Step 2: Convert to fraction form
    235,712.16/325,276.51 = 128,279.88/x
  3. Step 3: Cross multiply
    235,712.16x = 325,276.51 × 128,279.88
  4. Step 4: Simplify right side
    235,712.16x = 41,726,431,669.62
  5. Step 5: Solve for x
    x = 41,726,431,669.62/235,712.16
  6. Step 6: Final answer
    x = 177,022.82

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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.