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Finding the Fourth Proportional to 608.40, 838.60 and 477.20

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Solution

The fourth proportional to 608.40, 838.60 and 477.20 is: 657.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.40 : 838.60 = 477.20 : x
  2. Step 2: Convert to fraction form
    608.40/838.60 = 477.20/x
  3. Step 3: Cross multiply
    608.40x = 838.60 × 477.20
  4. Step 4: Simplify right side
    608.40x = 400,179.92
  5. Step 5: Solve for x
    x = 400,179.92/608.40
  6. Step 6: Final answer
    x = 657.76

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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.