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Finding the Fourth Proportional to 2,812, 4,218.08 and 760

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Solution

The fourth proportional to 2,812, 4,218.08 and 760 is: 1,140.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812 : 4,218.08 = 760 : x
  2. Step 2: Convert to fraction form
    2,812/4,218.08 = 760/x
  3. Step 3: Cross multiply
    2,812x = 4,218.08 × 760
  4. Step 4: Simplify right side
    2,812x = 3,205,740.80
  5. Step 5: Solve for x
    x = 3,205,740.80/2,812
  6. Step 6: Final answer
    x = 1,140.02

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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.