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Finding the Fourth Proportional to 2,420.58, 3,630.90 and 689.21

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Solution

The fourth proportional to 2,420.58, 3,630.90 and 689.21 is: 1,033.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,420.58 : 3,630.90 = 689.21 : x
  2. Step 2: Convert to fraction form
    2,420.58/3,630.90 = 689.21/x
  3. Step 3: Cross multiply
    2,420.58x = 3,630.90 × 689.21
  4. Step 4: Simplify right side
    2,420.58x = 2,502,434.43
  5. Step 5: Solve for x
    x = 2,502,434.43/2,420.58
  6. Step 6: Final answer
    x = 1,033.82

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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.