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Finding the Fourth Proportional to 518.02, 714.88 and 281.98

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Solution

The fourth proportional to 518.02, 714.88 and 281.98 is: 389.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.02 : 714.88 = 281.98 : x
  2. Step 2: Convert to fraction form
    518.02/714.88 = 281.98/x
  3. Step 3: Cross multiply
    518.02x = 714.88 × 281.98
  4. Step 4: Simplify right side
    518.02x = 201,576.88
  5. Step 5: Solve for x
    x = 201,576.88/518.02
  6. Step 6: Final answer
    x = 389.13

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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.