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Finding the Fourth Proportional to 768.12, 1,144.76 and 751.64

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Solution

The fourth proportional to 768.12, 1,144.76 and 751.64 is: 1,120.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.12 : 1,144.76 = 751.64 : x
  2. Step 2: Convert to fraction form
    768.12/1,144.76 = 751.64/x
  3. Step 3: Cross multiply
    768.12x = 1,144.76 × 751.64
  4. Step 4: Simplify right side
    768.12x = 860,447.41
  5. Step 5: Solve for x
    x = 860,447.41/768.12
  6. Step 6: Final answer
    x = 1,120.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.