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Finding the Fourth Proportional to 1,221.60, 1,830.96 and 605.12

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Solution

The fourth proportional to 1,221.60, 1,830.96 and 605.12 is: 906.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.60 : 1,830.96 = 605.12 : x
  2. Step 2: Convert to fraction form
    1,221.60/1,830.96 = 605.12/x
  3. Step 3: Cross multiply
    1,221.60x = 1,830.96 × 605.12
  4. Step 4: Simplify right side
    1,221.60x = 1,107,950.52
  5. Step 5: Solve for x
    x = 1,107,950.52/1,221.60
  6. Step 6: Final answer
    x = 906.97

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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.