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Finding the Fourth Proportional to 655.48, 983.88 and 640.78

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Solution

The fourth proportional to 655.48, 983.88 and 640.78 is: 961.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.48 : 983.88 = 640.78 : x
  2. Step 2: Convert to fraction form
    655.48/983.88 = 640.78/x
  3. Step 3: Cross multiply
    655.48x = 983.88 × 640.78
  4. Step 4: Simplify right side
    655.48x = 630,450.63
  5. Step 5: Solve for x
    x = 630,450.63/655.48
  6. Step 6: Final answer
    x = 961.82

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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.