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Finding the Fourth Proportional to 128,907.90, 177,979.62 and 98,639.16

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Solution

The fourth proportional to 128,907.90, 177,979.62 and 98,639.16 is: 136,188.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,907.90 : 177,979.62 = 98,639.16 : x
  2. Step 2: Convert to fraction form
    128,907.90/177,979.62 = 98,639.16/x
  3. Step 3: Cross multiply
    128,907.90x = 177,979.62 × 98,639.16
  4. Step 4: Simplify right side
    128,907.90x = 17,555,760,213.92
  5. Step 5: Solve for x
    x = 17,555,760,213.92/128,907.90
  6. Step 6: Final answer
    x = 136,188.40

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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.