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Finding the Fourth Proportional to 518.94, 714.56 and 485.89

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Solution

The fourth proportional to 518.94, 714.56 and 485.89 is: 669.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.94 : 714.56 = 485.89 : x
  2. Step 2: Convert to fraction form
    518.94/714.56 = 485.89/x
  3. Step 3: Cross multiply
    518.94x = 714.56 × 485.89
  4. Step 4: Simplify right side
    518.94x = 347,193.34
  5. Step 5: Solve for x
    x = 347,193.34/518.94
  6. Step 6: Final answer
    x = 669.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.