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Finding the Fourth Proportional to 515.40, 771.30 and 360.60

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Solution

The fourth proportional to 515.40, 771.30 and 360.60 is: 539.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.40 : 771.30 = 360.60 : x
  2. Step 2: Convert to fraction form
    515.40/771.30 = 360.60/x
  3. Step 3: Cross multiply
    515.40x = 771.30 × 360.60
  4. Step 4: Simplify right side
    515.40x = 278,130.78
  5. Step 5: Solve for x
    x = 278,130.78/515.40
  6. Step 6: Final answer
    x = 539.64

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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.