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Finding the Fourth Proportional to 517.58, 777.90 and 479.39

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Solution

The fourth proportional to 517.58, 777.90 and 479.39 is: 720.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.58 : 777.90 = 479.39 : x
  2. Step 2: Convert to fraction form
    517.58/777.90 = 479.39/x
  3. Step 3: Cross multiply
    517.58x = 777.90 × 479.39
  4. Step 4: Simplify right side
    517.58x = 372,915.39
  5. Step 5: Solve for x
    x = 372,915.39/517.58
  6. Step 6: Final answer
    x = 720.50

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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.