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Finding the Fourth Proportional to 612.72, 917.21 and 337.98

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Solution

The fourth proportional to 612.72, 917.21 and 337.98 is: 505.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.72 : 917.21 = 337.98 : x
  2. Step 2: Convert to fraction form
    612.72/917.21 = 337.98/x
  3. Step 3: Cross multiply
    612.72x = 917.21 × 337.98
  4. Step 4: Simplify right side
    612.72x = 309,999.48
  5. Step 5: Solve for x
    x = 309,999.48/612.72
  6. Step 6: Final answer
    x = 505.94

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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.