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Finding the Fourth Proportional to 136,987.54, 189,124.55 and 86,043.87

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Solution

The fourth proportional to 136,987.54, 189,124.55 and 86,043.87 is: 118,791.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,987.54 : 189,124.55 = 86,043.87 : x
  2. Step 2: Convert to fraction form
    136,987.54/189,124.55 = 86,043.87/x
  3. Step 3: Cross multiply
    136,987.54x = 189,124.55 × 86,043.87
  4. Step 4: Simplify right side
    136,987.54x = 16,273,008,409.12
  5. Step 5: Solve for x
    x = 16,273,008,409.12/136,987.54
  6. Step 6: Final answer
    x = 118,791.89

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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.