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Finding the Fourth Proportional to 3,280.72, 4,918.04 and 1,720.40

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Solution

The fourth proportional to 3,280.72, 4,918.04 and 1,720.40 is: 2,579.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,280.72 : 4,918.04 = 1,720.40 : x
  2. Step 2: Convert to fraction form
    3,280.72/4,918.04 = 1,720.40/x
  3. Step 3: Cross multiply
    3,280.72x = 4,918.04 × 1,720.40
  4. Step 4: Simplify right side
    3,280.72x = 8,460,996.02
  5. Step 5: Solve for x
    x = 8,460,996.02/3,280.72
  6. Step 6: Final answer
    x = 2,579.01

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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.