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Finding the Fourth Proportional to 656.99, 986.46 and 438.97

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Solution

The fourth proportional to 656.99, 986.46 and 438.97 is: 659.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.99 : 986.46 = 438.97 : x
  2. Step 2: Convert to fraction form
    656.99/986.46 = 438.97/x
  3. Step 3: Cross multiply
    656.99x = 986.46 × 438.97
  4. Step 4: Simplify right side
    656.99x = 433,026.55
  5. Step 5: Solve for x
    x = 433,026.55/656.99
  6. Step 6: Final answer
    x = 659.10

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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.