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Finding the Fourth Proportional to 5,142.76, 7,715.34 and 1,680

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Solution

The fourth proportional to 5,142.76, 7,715.34 and 1,680 is: 2,520.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,142.76 : 7,715.34 = 1,680 : x
  2. Step 2: Convert to fraction form
    5,142.76/7,715.34 = 1,680/x
  3. Step 3: Cross multiply
    5,142.76x = 7,715.34 × 1,680
  4. Step 4: Simplify right side
    5,142.76x = 12,961,771.20
  5. Step 5: Solve for x
    x = 12,961,771.20/5,142.76
  6. Step 6: Final answer
    x = 2,520.39

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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.