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Finding the Fourth Proportional to 128,893.52, 177,872.28 and 75,174.32

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Solution

The fourth proportional to 128,893.52, 177,872.28 and 75,174.32 is: 103,740.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,893.52 : 177,872.28 = 75,174.32 : x
  2. Step 2: Convert to fraction form
    128,893.52/177,872.28 = 75,174.32/x
  3. Step 3: Cross multiply
    128,893.52x = 177,872.28 × 75,174.32
  4. Step 4: Simplify right side
    128,893.52x = 13,371,427,695.85
  5. Step 5: Solve for x
    x = 13,371,427,695.85/128,893.52
  6. Step 6: Final answer
    x = 103,740.11

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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.