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Finding the Fourth Proportional to 2,420.47, 3,630.70 and 689.09

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Solution

The fourth proportional to 2,420.47, 3,630.70 and 689.09 is: 1,033.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,420.47 : 3,630.70 = 689.09 : x
  2. Step 2: Convert to fraction form
    2,420.47/3,630.70 = 689.09/x
  3. Step 3: Cross multiply
    2,420.47x = 3,630.70 × 689.09
  4. Step 4: Simplify right side
    2,420.47x = 2,501,879.61
  5. Step 5: Solve for x
    x = 2,501,879.61/2,420.47
  6. Step 6: Final answer
    x = 1,033.64

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1.5x scale

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.