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Finding the Fourth Proportional to 759.12, 1,138.20 and 485.55

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Solution

The fourth proportional to 759.12, 1,138.20 and 485.55 is: 728.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.12 : 1,138.20 = 485.55 : x
  2. Step 2: Convert to fraction form
    759.12/1,138.20 = 485.55/x
  3. Step 3: Cross multiply
    759.12x = 1,138.20 × 485.55
  4. Step 4: Simplify right side
    759.12x = 552,653.01
  5. Step 5: Solve for x
    x = 552,653.01/759.12
  6. Step 6: Final answer
    x = 728.02

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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.