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Finding the Fourth Proportional to 7,292.40, 10,939.80 and 3,134.40

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Solution

The fourth proportional to 7,292.40, 10,939.80 and 3,134.40 is: 4,702.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,292.40 : 10,939.80 = 3,134.40 : x
  2. Step 2: Convert to fraction form
    7,292.40/10,939.80 = 3,134.40/x
  3. Step 3: Cross multiply
    7,292.40x = 10,939.80 × 3,134.40
  4. Step 4: Simplify right side
    7,292.40x = 34,289,709.12
  5. Step 5: Solve for x
    x = 34,289,709.12/7,292.40
  6. Step 6: Final answer
    x = 4,702.12

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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.