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Finding the Fourth Proportional to 2,715.90, 4,073.67 and 768.30

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Solution

The fourth proportional to 2,715.90, 4,073.67 and 768.30 is: 1,152.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,715.90 : 4,073.67 = 768.30 : x
  2. Step 2: Convert to fraction form
    2,715.90/4,073.67 = 768.30/x
  3. Step 3: Cross multiply
    2,715.90x = 4,073.67 × 768.30
  4. Step 4: Simplify right side
    2,715.90x = 3,129,800.66
  5. Step 5: Solve for x
    x = 3,129,800.66/2,715.90
  6. Step 6: Final answer
    x = 1,152.40

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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.