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Finding the Fourth Proportional to 128,771.56, 177,607.29 and 112,828.42

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Solution

The fourth proportional to 128,771.56, 177,607.29 and 112,828.42 is: 155,617.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,771.56 : 177,607.29 = 112,828.42 : x
  2. Step 2: Convert to fraction form
    128,771.56/177,607.29 = 112,828.42/x
  3. Step 3: Cross multiply
    128,771.56x = 177,607.29 × 112,828.42
  4. Step 4: Simplify right side
    128,771.56x = 20,039,149,911.18
  5. Step 5: Solve for x
    x = 20,039,149,911.18/128,771.56
  6. Step 6: Final answer
    x = 155,617.82

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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.