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Finding the Fourth Proportional to 1,221.60, 1,829.52 and 945.48

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Solution

The fourth proportional to 1,221.60, 1,829.52 and 945.48 is: 1,415.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.60 : 1,829.52 = 945.48 : x
  2. Step 2: Convert to fraction form
    1,221.60/1,829.52 = 945.48/x
  3. Step 3: Cross multiply
    1,221.60x = 1,829.52 × 945.48
  4. Step 4: Simplify right side
    1,221.60x = 1,729,774.57
  5. Step 5: Solve for x
    x = 1,729,774.57/1,221.60
  6. Step 6: Final answer
    x = 1,415.99

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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.