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Finding the Fourth Proportional to 648.80, 891.64 and 607.79

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Solution

The fourth proportional to 648.80, 891.64 and 607.79 is: 835.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.80 : 891.64 = 607.79 : x
  2. Step 2: Convert to fraction form
    648.80/891.64 = 607.79/x
  3. Step 3: Cross multiply
    648.80x = 891.64 × 607.79
  4. Step 4: Simplify right side
    648.80x = 541,923.90
  5. Step 5: Solve for x
    x = 541,923.90/648.80
  6. Step 6: Final answer
    x = 835.28

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.