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Finding the Fourth Proportional to 640.34, 883.84 and 378.53

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Solution

The fourth proportional to 640.34, 883.84 and 378.53 is: 522.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.34 : 883.84 = 378.53 : x
  2. Step 2: Convert to fraction form
    640.34/883.84 = 378.53/x
  3. Step 3: Cross multiply
    640.34x = 883.84 × 378.53
  4. Step 4: Simplify right side
    640.34x = 334,559.96
  5. Step 5: Solve for x
    x = 334,559.96/640.34
  6. Step 6: Final answer
    x = 522.47

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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.