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Finding the Fourth Proportional to 608.45, 839.48 and 356.31

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Solution

The fourth proportional to 608.45, 839.48 and 356.31 is: 491.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.45 : 839.48 = 356.31 : x
  2. Step 2: Convert to fraction form
    608.45/839.48 = 356.31/x
  3. Step 3: Cross multiply
    608.45x = 839.48 × 356.31
  4. Step 4: Simplify right side
    608.45x = 299,113.34
  5. Step 5: Solve for x
    x = 299,113.34/608.45
  6. Step 6: Final answer
    x = 491.60

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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.