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Finding the Fourth Proportional to 517.81, 776.35 and 415.06

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Solution

The fourth proportional to 517.81, 776.35 and 415.06 is: 622.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.81 : 776.35 = 415.06 : x
  2. Step 2: Convert to fraction form
    517.81/776.35 = 415.06/x
  3. Step 3: Cross multiply
    517.81x = 776.35 × 415.06
  4. Step 4: Simplify right side
    517.81x = 322,231.83
  5. Step 5: Solve for x
    x = 322,231.83/517.81
  6. Step 6: Final answer
    x = 622.30

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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.