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Finding the Fourth Proportional to 93,429.20, 140,143.80 and 86,212.10

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Solution

The fourth proportional to 93,429.20, 140,143.80 and 86,212.10 is: 129,318.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,429.20 : 140,143.80 = 86,212.10 : x
  2. Step 2: Convert to fraction form
    93,429.20/140,143.80 = 86,212.10/x
  3. Step 3: Cross multiply
    93,429.20x = 140,143.80 × 86,212.10
  4. Step 4: Simplify right side
    93,429.20x = 12,082,091,299.98
  5. Step 5: Solve for x
    x = 12,082,091,299.98/93,429.20
  6. Step 6: Final answer
    x = 129,318.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.