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Finding the Fourth Proportional to 769.25, 1,153.42 and 421.99

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Solution

The fourth proportional to 769.25, 1,153.42 and 421.99 is: 632.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.25 : 1,153.42 = 421.99 : x
  2. Step 2: Convert to fraction form
    769.25/1,153.42 = 421.99/x
  3. Step 3: Cross multiply
    769.25x = 1,153.42 × 421.99
  4. Step 4: Simplify right side
    769.25x = 486,731.71
  5. Step 5: Solve for x
    x = 486,731.71/769.25
  6. Step 6: Final answer
    x = 632.74

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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.