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Finding the Fourth Proportional to 519.64, 781.38 and 479.32

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Solution

The fourth proportional to 519.64, 781.38 and 479.32 is: 720.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.64 : 781.38 = 479.32 : x
  2. Step 2: Convert to fraction form
    519.64/781.38 = 479.32/x
  3. Step 3: Cross multiply
    519.64x = 781.38 × 479.32
  4. Step 4: Simplify right side
    519.64x = 374,531.06
  5. Step 5: Solve for x
    x = 374,531.06/519.64
  6. Step 6: Final answer
    x = 720.75

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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.