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Finding the Fourth Proportional to 1,956.78, 2,935.62 and 640.58

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Solution

The fourth proportional to 1,956.78, 2,935.62 and 640.58 is: 961.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,956.78 : 2,935.62 = 640.58 : x
  2. Step 2: Convert to fraction form
    1,956.78/2,935.62 = 640.58/x
  3. Step 3: Cross multiply
    1,956.78x = 2,935.62 × 640.58
  4. Step 4: Simplify right side
    1,956.78x = 1,880,484.78
  5. Step 5: Solve for x
    x = 1,880,484.78/1,956.78
  6. Step 6: Final answer
    x = 961.01

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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.