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Finding the Fourth Proportional to 128,867.42, 177,758.43 and 85,259.90

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Solution

The fourth proportional to 128,867.42, 177,758.43 and 85,259.90 is: 117,606.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,867.42 : 177,758.43 = 85,259.90 : x
  2. Step 2: Convert to fraction form
    128,867.42/177,758.43 = 85,259.90/x
  3. Step 3: Cross multiply
    128,867.42x = 177,758.43 × 85,259.90
  4. Step 4: Simplify right side
    128,867.42x = 15,155,665,965.96
  5. Step 5: Solve for x
    x = 15,155,665,965.96/128,867.42
  6. Step 6: Final answer
    x = 117,606.65

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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.