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Finding the Fourth Proportional to 775.20, 1,161.60 and 652.80

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Solution

The fourth proportional to 775.20, 1,161.60 and 652.80 is: 978.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.20 : 1,161.60 = 652.80 : x
  2. Step 2: Convert to fraction form
    775.20/1,161.60 = 652.80/x
  3. Step 3: Cross multiply
    775.20x = 1,161.60 × 652.80
  4. Step 4: Simplify right side
    775.20x = 758,292.48
  5. Step 5: Solve for x
    x = 758,292.48/775.20
  6. Step 6: Final answer
    x = 978.19

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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.