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Finding the Fourth Proportional to 128,823, 177,715.26 and 91,118.04

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Solution

The fourth proportional to 128,823, 177,715.26 and 91,118.04 is: 125,700.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,823 : 177,715.26 = 91,118.04 : x
  2. Step 2: Convert to fraction form
    128,823/177,715.26 = 91,118.04/x
  3. Step 3: Cross multiply
    128,823x = 177,715.26 × 91,118.04
  4. Step 4: Simplify right side
    128,823x = 16,193,066,169.29
  5. Step 5: Solve for x
    x = 16,193,066,169.29/128,823
  6. Step 6: Final answer
    x = 125,700.12

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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.