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Finding the Fourth Proportional to 128,817, 177,706.98 and 91,112.04

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Solution

The fourth proportional to 128,817, 177,706.98 and 91,112.04 is: 125,691.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,817 : 177,706.98 = 91,112.04 : x
  2. Step 2: Convert to fraction form
    128,817/177,706.98 = 91,112.04/x
  3. Step 3: Cross multiply
    128,817x = 177,706.98 × 91,112.04
  4. Step 4: Simplify right side
    128,817x = 16,191,245,470.04
  5. Step 5: Solve for x
    x = 16,191,245,470.04/128,817
  6. Step 6: Final answer
    x = 125,691.84

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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.