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Finding the Fourth Proportional to 1,744.40, 2,616.40 and 648.64

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Solution

The fourth proportional to 1,744.40, 2,616.40 and 648.64 is: 972.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,744.40 : 2,616.40 = 648.64 : x
  2. Step 2: Convert to fraction form
    1,744.40/2,616.40 = 648.64/x
  3. Step 3: Cross multiply
    1,744.40x = 2,616.40 × 648.64
  4. Step 4: Simplify right side
    1,744.40x = 1,697,105.78
  5. Step 5: Solve for x
    x = 1,697,105.78/1,744.40
  6. Step 6: Final answer
    x = 972.89

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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.