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Finding the Fourth Proportional to 640.53, 883.93 and 378.71

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Solution

The fourth proportional to 640.53, 883.93 and 378.71 is: 522.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.53 : 883.93 = 378.71 : x
  2. Step 2: Convert to fraction form
    640.53/883.93 = 378.71/x
  3. Step 3: Cross multiply
    640.53x = 883.93 × 378.71
  4. Step 4: Simplify right side
    640.53x = 334,751.87
  5. Step 5: Solve for x
    x = 334,751.87/640.53
  6. Step 6: Final answer
    x = 522.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.