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Finding the Fourth Proportional to 128,827, 177,720.78 and 91,122.04

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Solution

The fourth proportional to 128,827, 177,720.78 and 91,122.04 is: 125,705.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,827 : 177,720.78 = 91,122.04 : x
  2. Step 2: Convert to fraction form
    128,827/177,720.78 = 91,122.04/x
  3. Step 3: Cross multiply
    128,827x = 177,720.78 × 91,122.04
  4. Step 4: Simplify right side
    128,827x = 16,194,280,023.99
  5. Step 5: Solve for x
    x = 16,194,280,023.99/128,827
  6. Step 6: Final answer
    x = 125,705.64

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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.