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Finding the Fourth Proportional to 2,187.04, 3,280 and 648.04

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Solution

The fourth proportional to 2,187.04, 3,280 and 648.04 is: 971.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.04 : 3,280 = 648.04 : x
  2. Step 2: Convert to fraction form
    2,187.04/3,280 = 648.04/x
  3. Step 3: Cross multiply
    2,187.04x = 3,280 × 648.04
  4. Step 4: Simplify right side
    2,187.04x = 2,125,571.20
  5. Step 5: Solve for x
    x = 2,125,571.20/2,187.04
  6. Step 6: Final answer
    x = 971.89

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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.