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Finding the Fourth Proportional to 608.28, 840.38 and 578.31

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Solution

The fourth proportional to 608.28, 840.38 and 578.31 is: 798.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.28 : 840.38 = 578.31 : x
  2. Step 2: Convert to fraction form
    608.28/840.38 = 578.31/x
  3. Step 3: Cross multiply
    608.28x = 840.38 × 578.31
  4. Step 4: Simplify right side
    608.28x = 486,000.16
  5. Step 5: Solve for x
    x = 486,000.16/608.28
  6. Step 6: Final answer
    x = 798.97

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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.