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Finding the Fourth Proportional to 864.78, 1,296.63 and 480.30

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Solution

The fourth proportional to 864.78, 1,296.63 and 480.30 is: 720.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.78 : 1,296.63 = 480.30 : x
  2. Step 2: Convert to fraction form
    864.78/1,296.63 = 480.30/x
  3. Step 3: Cross multiply
    864.78x = 1,296.63 × 480.30
  4. Step 4: Simplify right side
    864.78x = 622,771.39
  5. Step 5: Solve for x
    x = 622,771.39/864.78
  6. Step 6: Final answer
    x = 720.15

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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.