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Finding the Fourth Proportional to 728.60, 1,093.28 and 455.36

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Solution

The fourth proportional to 728.60, 1,093.28 and 455.36 is: 683.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.60 : 1,093.28 = 455.36 : x
  2. Step 2: Convert to fraction form
    728.60/1,093.28 = 455.36/x
  3. Step 3: Cross multiply
    728.60x = 1,093.28 × 455.36
  4. Step 4: Simplify right side
    728.60x = 497,835.98
  5. Step 5: Solve for x
    x = 497,835.98/728.60
  6. Step 6: Final answer
    x = 683.28

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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.