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Finding the Fourth Proportional to 621.84, 858.20 and 385.94

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Solution

The fourth proportional to 621.84, 858.20 and 385.94 is: 532.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.84 : 858.20 = 385.94 : x
  2. Step 2: Convert to fraction form
    621.84/858.20 = 385.94/x
  3. Step 3: Cross multiply
    621.84x = 858.20 × 385.94
  4. Step 4: Simplify right side
    621.84x = 331,207.49
  5. Step 5: Solve for x
    x = 331,207.49/621.84
  6. Step 6: Final answer
    x = 532.62

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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.