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Finding the Fourth Proportional to 135,431.87, 186,833.93 and 87,700.59

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Solution

The fourth proportional to 135,431.87, 186,833.93 and 87,700.59 is: 120,986.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,431.87 : 186,833.93 = 87,700.59 : x
  2. Step 2: Convert to fraction form
    135,431.87/186,833.93 = 87,700.59/x
  3. Step 3: Cross multiply
    135,431.87x = 186,833.93 × 87,700.59
  4. Step 4: Simplify right side
    135,431.87x = 16,385,445,454.52
  5. Step 5: Solve for x
    x = 16,385,445,454.52/135,431.87
  6. Step 6: Final answer
    x = 120,986.63

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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.