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Finding the Fourth Proportional to 768.66, 1,153.26 and 421.62

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Solution

The fourth proportional to 768.66, 1,153.26 and 421.62 is: 632.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.66 : 1,153.26 = 421.62 : x
  2. Step 2: Convert to fraction form
    768.66/1,153.26 = 421.62/x
  3. Step 3: Cross multiply
    768.66x = 1,153.26 × 421.62
  4. Step 4: Simplify right side
    768.66x = 486,237.48
  5. Step 5: Solve for x
    x = 486,237.48/768.66
  6. Step 6: Final answer
    x = 632.58

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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.