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Finding the Fourth Proportional to 2,420.52, 3,630.90 and 689

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Solution

The fourth proportional to 2,420.52, 3,630.90 and 689 is: 1,033.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,420.52 : 3,630.90 = 689 : x
  2. Step 2: Convert to fraction form
    2,420.52/3,630.90 = 689/x
  3. Step 3: Cross multiply
    2,420.52x = 3,630.90 × 689
  4. Step 4: Simplify right side
    2,420.52x = 2,501,690.10
  5. Step 5: Solve for x
    x = 2,501,690.10/2,420.52
  6. Step 6: Final answer
    x = 1,033.53

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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.