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Finding the Fourth Proportional to 1,217.60, 1,825.58 and 486.80

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Solution

The fourth proportional to 1,217.60, 1,825.58 and 486.80 is: 729.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.60 : 1,825.58 = 486.80 : x
  2. Step 2: Convert to fraction form
    1,217.60/1,825.58 = 486.80/x
  3. Step 3: Cross multiply
    1,217.60x = 1,825.58 × 486.80
  4. Step 4: Simplify right side
    1,217.60x = 888,692.34
  5. Step 5: Solve for x
    x = 888,692.34/1,217.60
  6. Step 6: Final answer
    x = 729.87

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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.