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Finding the Fourth Proportional to 136,988.60, 189,164.52 and 86,089.50

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Solution

The fourth proportional to 136,988.60, 189,164.52 and 86,089.50 is: 118,879.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,988.60 : 189,164.52 = 86,089.50 : x
  2. Step 2: Convert to fraction form
    136,988.60/189,164.52 = 86,089.50/x
  3. Step 3: Cross multiply
    136,988.60x = 189,164.52 × 86,089.50
  4. Step 4: Simplify right side
    136,988.60x = 16,285,078,944.54
  5. Step 5: Solve for x
    x = 16,285,078,944.54/136,988.60
  6. Step 6: Final answer
    x = 118,879.09

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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.