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Finding the Fourth Proportional to 656.94, 985.64 and 438.44

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Solution

The fourth proportional to 656.94, 985.64 and 438.44 is: 657.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.94 : 985.64 = 438.44 : x
  2. Step 2: Convert to fraction form
    656.94/985.64 = 438.44/x
  3. Step 3: Cross multiply
    656.94x = 985.64 × 438.44
  4. Step 4: Simplify right side
    656.94x = 432,144.00
  5. Step 5: Solve for x
    x = 432,144.00/656.94
  6. Step 6: Final answer
    x = 657.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.