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Finding the Fourth Proportional to 128,761.62, 177,699.24 and 72,173

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Solution

The fourth proportional to 128,761.62, 177,699.24 and 72,173 is: 99,603.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,761.62 : 177,699.24 = 72,173 : x
  2. Step 2: Convert to fraction form
    128,761.62/177,699.24 = 72,173/x
  3. Step 3: Cross multiply
    128,761.62x = 177,699.24 × 72,173
  4. Step 4: Simplify right side
    128,761.62x = 12,825,087,248.52
  5. Step 5: Solve for x
    x = 12,825,087,248.52/128,761.62
  6. Step 6: Final answer
    x = 99,603.34

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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.