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Finding the Fourth Proportional to 767.58, 1,151.39 and 305.25

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Solution

The fourth proportional to 767.58, 1,151.39 and 305.25 is: 457.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.58 : 1,151.39 = 305.25 : x
  2. Step 2: Convert to fraction form
    767.58/1,151.39 = 305.25/x
  3. Step 3: Cross multiply
    767.58x = 1,151.39 × 305.25
  4. Step 4: Simplify right side
    767.58x = 351,461.80
  5. Step 5: Solve for x
    x = 351,461.80/767.58
  6. Step 6: Final answer
    x = 457.88

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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.