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Finding the Fourth Proportional to 640, 883.34 and 378.16

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Solution

The fourth proportional to 640, 883.34 and 378.16 is: 521.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    640 : 883.34 = 378.16 : x
  2. Step 2: Convert to fraction form
    640/883.34 = 378.16/x
  3. Step 3: Cross multiply
    640x = 883.34 × 378.16
  4. Step 4: Simplify right side
    640x = 334,043.85
  5. Step 5: Solve for x
    x = 334,043.85/640
  6. Step 6: Final answer
    x = 521.94

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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.