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Finding the Fourth Proportional to 128,704.17, 177,611.81 and 78,403.17

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Solution

The fourth proportional to 128,704.17, 177,611.81 and 78,403.17 is: 108,196.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,704.17 : 177,611.81 = 78,403.17 : x
  2. Step 2: Convert to fraction form
    128,704.17/177,611.81 = 78,403.17/x
  3. Step 3: Cross multiply
    128,704.17x = 177,611.81 × 78,403.17
  4. Step 4: Simplify right side
    128,704.17x = 13,925,328,933.44
  5. Step 5: Solve for x
    x = 13,925,328,933.44/128,704.17
  6. Step 6: Final answer
    x = 108,196.41

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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.