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Finding the Fourth Proportional to 135,390, 186,812.28 and 87,636.72

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Solution

The fourth proportional to 135,390, 186,812.28 and 87,636.72 is: 120,921.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,390 : 186,812.28 = 87,636.72 : x
  2. Step 2: Convert to fraction form
    135,390/186,812.28 = 87,636.72/x
  3. Step 3: Cross multiply
    135,390x = 186,812.28 × 87,636.72
  4. Step 4: Simplify right side
    135,390x = 16,371,615,474.92
  5. Step 5: Solve for x
    x = 16,371,615,474.92/135,390
  6. Step 6: Final answer
    x = 120,921.90

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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.