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Finding the Fourth Proportional to 128,814, 177,702.84 and 91,109.04

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Solution

The fourth proportional to 128,814, 177,702.84 and 91,109.04 is: 125,687.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,814 : 177,702.84 = 91,109.04 : x
  2. Step 2: Convert to fraction form
    128,814/177,702.84 = 91,109.04/x
  3. Step 3: Cross multiply
    128,814x = 177,702.84 × 91,109.04
  4. Step 4: Simplify right side
    128,814x = 16,190,335,157.67
  5. Step 5: Solve for x
    x = 16,190,335,157.67/128,814
  6. Step 6: Final answer
    x = 125,687.70

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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.