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Finding the Fourth Proportional to 767.56, 1,151.04 and 421.18

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Solution

The fourth proportional to 767.56, 1,151.04 and 421.18 is: 631.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.56 : 1,151.04 = 421.18 : x
  2. Step 2: Convert to fraction form
    767.56/1,151.04 = 421.18/x
  3. Step 3: Cross multiply
    767.56x = 1,151.04 × 421.18
  4. Step 4: Simplify right side
    767.56x = 484,795.03
  5. Step 5: Solve for x
    x = 484,795.03/767.56
  6. Step 6: Final answer
    x = 631.61

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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.