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Finding the Fourth Proportional to 128,763.62, 177,702 and 72,175

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Solution

The fourth proportional to 128,763.62, 177,702 and 72,175 is: 99,606.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,763.62 : 177,702 = 72,175 : x
  2. Step 2: Convert to fraction form
    128,763.62/177,702 = 72,175/x
  3. Step 3: Cross multiply
    128,763.62x = 177,702 × 72,175
  4. Step 4: Simplify right side
    128,763.62x = 12,825,641,850
  5. Step 5: Solve for x
    x = 12,825,641,850/128,763.62
  6. Step 6: Final answer
    x = 99,606.10

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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.