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Finding the Fourth Proportional to 2,420.91, 3,631.38 and 860.94

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Solution

The fourth proportional to 2,420.91, 3,631.38 and 860.94 is: 1,291.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,420.91 : 3,631.38 = 860.94 : x
  2. Step 2: Convert to fraction form
    2,420.91/3,631.38 = 860.94/x
  3. Step 3: Cross multiply
    2,420.91x = 3,631.38 × 860.94
  4. Step 4: Simplify right side
    2,420.91x = 3,126,400.30
  5. Step 5: Solve for x
    x = 3,126,400.30/2,420.91
  6. Step 6: Final answer
    x = 1,291.42

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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.