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Finding the Fourth Proportional to 729.60, 1,023.60 and 729.60

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Solution

The fourth proportional to 729.60, 1,023.60 and 729.60 is: 1,023.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.60 : 1,023.60 = 729.60 : x
  2. Step 2: Convert to fraction form
    729.60/1,023.60 = 729.60/x
  3. Step 3: Cross multiply
    729.60x = 1,023.60 × 729.60
  4. Step 4: Simplify right side
    729.60x = 746,818.56
  5. Step 5: Solve for x
    x = 746,818.56/729.60
  6. Step 6: Final answer
    x = 1,023.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.