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Finding the Fourth Proportional to 515.40, 771.88 and 379.32

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Solution

The fourth proportional to 515.40, 771.88 and 379.32 is: 568.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.40 : 771.88 = 379.32 : x
  2. Step 2: Convert to fraction form
    515.40/771.88 = 379.32/x
  3. Step 3: Cross multiply
    515.40x = 771.88 × 379.32
  4. Step 4: Simplify right side
    515.40x = 292,789.52
  5. Step 5: Solve for x
    x = 292,789.52/515.40
  6. Step 6: Final answer
    x = 568.08

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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.