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Finding the Fourth Proportional to 767.96, 1,152.80 and 480.05

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Solution

The fourth proportional to 767.96, 1,152.80 and 480.05 is: 720.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.96 : 1,152.80 = 480.05 : x
  2. Step 2: Convert to fraction form
    767.96/1,152.80 = 480.05/x
  3. Step 3: Cross multiply
    767.96x = 1,152.80 × 480.05
  4. Step 4: Simplify right side
    767.96x = 553,401.64
  5. Step 5: Solve for x
    x = 553,401.64/767.96
  6. Step 6: Final answer
    x = 720.61

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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.