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Finding the Fourth Proportional to 128,963.40, 177,676.74 and 99,791.47

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Solution

The fourth proportional to 128,963.40, 177,676.74 and 99,791.47 is: 137,485.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,963.40 : 177,676.74 = 99,791.47 : x
  2. Step 2: Convert to fraction form
    128,963.40/177,676.74 = 99,791.47/x
  3. Step 3: Cross multiply
    128,963.40x = 177,676.74 × 99,791.47
  4. Step 4: Simplify right side
    128,963.40x = 17,730,623,107.54
  5. Step 5: Solve for x
    x = 17,730,623,107.54/128,963.40
  6. Step 6: Final answer
    x = 137,485.70

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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.