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Finding the Fourth Proportional to 768.75, 1,153.60 and 403.80

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Solution

The fourth proportional to 768.75, 1,153.60 and 403.80 is: 605.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.75 : 1,153.60 = 403.80 : x
  2. Step 2: Convert to fraction form
    768.75/1,153.60 = 403.80/x
  3. Step 3: Cross multiply
    768.75x = 1,153.60 × 403.80
  4. Step 4: Simplify right side
    768.75x = 465,822.67
  5. Step 5: Solve for x
    x = 465,822.67/768.75
  6. Step 6: Final answer
    x = 605.95

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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.