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Finding the Fourth Proportional to 7,260, 10,890.12 and 3,156

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Solution

The fourth proportional to 7,260, 10,890.12 and 3,156 is: 4,734.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,260 : 10,890.12 = 3,156 : x
  2. Step 2: Convert to fraction form
    7,260/10,890.12 = 3,156/x
  3. Step 3: Cross multiply
    7,260x = 10,890.12 × 3,156
  4. Step 4: Simplify right side
    7,260x = 34,369,218.72
  5. Step 5: Solve for x
    x = 34,369,218.72/7,260
  6. Step 6: Final answer
    x = 4,734.05

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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.