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Finding the Fourth Proportional to 131,138.56, 181,036.57 and 85,885.89

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Solution

The fourth proportional to 131,138.56, 181,036.57 and 85,885.89 is: 118,565.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,138.56 : 181,036.57 = 85,885.89 : x
  2. Step 2: Convert to fraction form
    131,138.56/181,036.57 = 85,885.89/x
  3. Step 3: Cross multiply
    131,138.56x = 181,036.57 × 85,885.89
  4. Step 4: Simplify right side
    131,138.56x = 15,548,486,204.43
  5. Step 5: Solve for x
    x = 15,548,486,204.43/131,138.56
  6. Step 6: Final answer
    x = 118,565.33

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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.