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Finding the Fourth Proportional to 621.81, 858.12 and 356.34

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Solution

The fourth proportional to 621.81, 858.12 and 356.34 is: 491.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.81 : 858.12 = 356.34 : x
  2. Step 2: Convert to fraction form
    621.81/858.12 = 356.34/x
  3. Step 3: Cross multiply
    621.81x = 858.12 × 356.34
  4. Step 4: Simplify right side
    621.81x = 305,783.17
  5. Step 5: Solve for x
    x = 305,783.17/621.81
  6. Step 6: Final answer
    x = 491.76

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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.