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Finding the Fourth Proportional to 640.32, 959.04 and 618.72

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Solution

The fourth proportional to 640.32, 959.04 and 618.72 is: 926.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.32 : 959.04 = 618.72 : x
  2. Step 2: Convert to fraction form
    640.32/959.04 = 618.72/x
  3. Step 3: Cross multiply
    640.32x = 959.04 × 618.72
  4. Step 4: Simplify right side
    640.32x = 593,377.23
  5. Step 5: Solve for x
    x = 593,377.23/640.32
  6. Step 6: Final answer
    x = 926.69

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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.