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Finding the Fourth Proportional to 640, 959.80 and 229.08

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Solution

The fourth proportional to 640, 959.80 and 229.08 is: 343.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    640 : 959.80 = 229.08 : x
  2. Step 2: Convert to fraction form
    640/959.80 = 229.08/x
  3. Step 3: Cross multiply
    640x = 959.80 × 229.08
  4. Step 4: Simplify right side
    640x = 219,870.98
  5. Step 5: Solve for x
    x = 219,870.98/640
  6. Step 6: Final answer
    x = 343.55

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