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Finding the Fourth Proportional to 1,209.25, 1,813.88 and 439.75

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Solution

The fourth proportional to 1,209.25, 1,813.88 and 439.75 is: 659.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.25 : 1,813.88 = 439.75 : x
  2. Step 2: Convert to fraction form
    1,209.25/1,813.88 = 439.75/x
  3. Step 3: Cross multiply
    1,209.25x = 1,813.88 × 439.75
  4. Step 4: Simplify right side
    1,209.25x = 797,653.73
  5. Step 5: Solve for x
    x = 797,653.73/1,209.25
  6. Step 6: Final answer
    x = 659.63

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.