Home / 1,631.30-2,445.60-861.80

Finding the Fourth Proportional to 1,631.30, 2,445.60 and 861.80

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Solution

The fourth proportional to 1,631.30, 2,445.60 and 861.80 is: 1,291.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,631.30 : 2,445.60 = 861.80 : x
  2. Step 2: Convert to fraction form
    1,631.30/2,445.60 = 861.80/x
  3. Step 3: Cross multiply
    1,631.30x = 2,445.60 × 861.80
  4. Step 4: Simplify right side
    1,631.30x = 2,107,618.08
  5. Step 5: Solve for x
    x = 2,107,618.08/1,631.30
  6. Step 6: Final answer
    x = 1,291.99

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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.