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Finding the Fourth Proportional to 311,078.79, 466,617.92 and 86,439.12

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Solution

The fourth proportional to 311,078.79, 466,617.92 and 86,439.12 is: 129,658.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,078.79 : 466,617.92 = 86,439.12 : x
  2. Step 2: Convert to fraction form
    311,078.79/466,617.92 = 86,439.12/x
  3. Step 3: Cross multiply
    311,078.79x = 466,617.92 × 86,439.12
  4. Step 4: Simplify right side
    311,078.79x = 40,334,040,047.94
  5. Step 5: Solve for x
    x = 40,334,040,047.94/311,078.79
  6. Step 6: Final answer
    x = 129,658.60

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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.