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Finding the Fourth Proportional to 1,171.04, 1,615.20 and 728.96

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Solution

The fourth proportional to 1,171.04, 1,615.20 and 728.96 is: 1,005.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.04 : 1,615.20 = 728.96 : x
  2. Step 2: Convert to fraction form
    1,171.04/1,615.20 = 728.96/x
  3. Step 3: Cross multiply
    1,171.04x = 1,615.20 × 728.96
  4. Step 4: Simplify right side
    1,171.04x = 1,177,416.19
  5. Step 5: Solve for x
    x = 1,177,416.19/1,171.04
  6. Step 6: Final answer
    x = 1,005.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.